diff --git a/circuits/plonk-15-wires/src/gate.rs b/circuits/plonk-15-wires/src/gate.rs
index 7e7aaed0fe..6ad1988938 100644
--- a/circuits/plonk-15-wires/src/gate.rs
+++ b/circuits/plonk-15-wires/src/gate.rs
@@ -117,7 +117,7 @@ impl<F: Field> JointLookup<F> {
 )]
 #[cfg_attr(
     feature = "ocaml_types",
-    derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::OcamlEnum)
+    derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Enum)
 )]
 #[cfg_attr(test, derive(proptest_derive::Arbitrary))]
 pub enum GateType {
@@ -423,10 +423,9 @@ pub mod caml {
     use super::*;
     use crate::wires::caml::CamlWire;
     use itertools::Itertools;
-    use ocaml_gen::OcamlGen;
     use std::convert::TryInto;
 
-    #[derive(ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlCircuitGate<F> {
         pub row: ocaml::Int,
         pub typ: GateType,
diff --git a/circuits/plonk-15-wires/src/nolookup/scalars.rs b/circuits/plonk-15-wires/src/nolookup/scalars.rs
index 80a9292471..c61c12df02 100644
--- a/circuits/plonk-15-wires/src/nolookup/scalars.rs
+++ b/circuits/plonk-15-wires/src/nolookup/scalars.rs
@@ -102,14 +102,13 @@ impl<F: Field> Default for RandomOracles<F> {
 #[cfg(feature = "ocaml_types")]
 pub mod caml {
     use super::*;
-    use ocaml_gen::OcamlGen;
     use oracle::sponge::caml::CamlScalarChallenge;
 
     //
     // CamlLookupEvaluations<CamlF>
     //
 
-    #[derive(Clone, ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(Clone, ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlLookupEvaluations<CamlF> {
         pub sorted: Vec<Vec<CamlF>>,
         pub aggreg: Vec<CamlF>,
@@ -155,7 +154,7 @@ pub mod caml {
     // CamlProofEvaluations<CamlF>
     //
 
-    #[derive(Clone, ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(Clone, ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlProofEvaluations<CamlF> {
         pub w: (
             Vec<CamlF>,
@@ -279,7 +278,7 @@ pub mod caml {
     // RandomOracles<F> <-> CamlRandomOracles<CamlF>
     //
 
-    #[derive(ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlRandomOracles<CamlF> {
         pub joint_combiner: (CamlScalarChallenge<CamlF>, CamlF),
         pub beta: CamlF,
diff --git a/circuits/plonk-15-wires/src/wires.rs b/circuits/plonk-15-wires/src/wires.rs
index 71d3d48f54..1dd228969c 100644
--- a/circuits/plonk-15-wires/src/wires.rs
+++ b/circuits/plonk-15-wires/src/wires.rs
@@ -58,10 +58,9 @@ impl FromBytes for Wire {
 #[cfg(feature = "ocaml_types")]
 pub mod caml {
     use super::*;
-    use ocaml_gen::OcamlGen;
     use std::convert::TryInto;
 
-    #[derive(ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlWire {
         pub row: ocaml::Int,
         pub col: ocaml::Int,
diff --git a/circuits/plonk/src/scalars.rs b/circuits/plonk/src/scalars.rs
index addd439700..aa5c8a3ce8 100644
--- a/circuits/plonk/src/scalars.rs
+++ b/circuits/plonk/src/scalars.rs
@@ -75,14 +75,13 @@ impl<F: Field> RandomOracles<F> {
 #[cfg(feature = "ocaml_types")]
 pub mod caml {
     use super::*;
-    use ocaml_gen::OcamlGen;
     use oracle::sponge::caml::CamlScalarChallenge;
 
     //
     // ProofEvaluations<F> <-> CamlProofEvaluations<CamlF>
     //
 
-    #[derive(Clone, ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(Clone, ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlProofEvaluations<F> {
         pub l: Vec<F>,
         pub r: Vec<F>,
@@ -134,7 +133,7 @@ pub mod caml {
     // RandomOracles<F> <-> CamlRandomOracles<CamlF>
     //
 
-    #[derive(ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlRandomOracles<CamlF> {
         pub beta: CamlF,
         pub gamma: CamlF,
diff --git a/dlog/commitment/src/commitment.rs b/dlog/commitment/src/commitment.rs
index 3a7a8756e7..835fea4578 100644
--- a/dlog/commitment/src/commitment.rs
+++ b/dlog/commitment/src/commitment.rs
@@ -1165,11 +1165,10 @@ mod tests {
 #[cfg(feature = "ocaml_types")]
 pub mod caml {
     use super::*;
-    use ocaml_gen::OcamlGen;
 
     // polynomial commitment
 
-    #[derive(Clone, Debug, ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(Clone, Debug, ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlPolyComm<CamlG> {
         pub unshifted: Vec<CamlG>,
         pub shifted: Option<CamlG>,
@@ -1229,7 +1228,7 @@ pub mod caml {
 
     // opening proof
 
-    #[derive(ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlOpeningProof<G, F> {
         pub lr: Vec<(G, G)>, // vector of rounds of L & R commitments
         pub delta: G,
diff --git a/dlog/plonk-15-wires/src/prover.rs b/dlog/plonk-15-wires/src/prover.rs
index 49c95eed7d..8ad2196af3 100644
--- a/dlog/plonk-15-wires/src/prover.rs
+++ b/dlog/plonk-15-wires/src/prover.rs
@@ -709,10 +709,9 @@ where
 pub mod caml {
     use super::*;
     use commitment_dlog::commitment::caml::{CamlOpeningProof, CamlPolyComm};
-    use ocaml_gen::OcamlGen;
     use plonk_15_wires_circuits::nolookup::scalars::caml::CamlProofEvaluations;
 
-    #[derive(ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlProverProof<CamlG, CamlF> {
         pub commitments: CamlProverCommitments<CamlG>,
         pub proof: CamlOpeningProof<CamlG, CamlF>,
@@ -723,7 +722,7 @@ pub mod caml {
         pub prev_challenges: Vec<(Vec<CamlF>, CamlPolyComm<CamlG>)>,
     }
 
-    #[derive(Clone, ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(Clone, ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlProverCommitments<CamlG> {
         // polynomial commitments
         pub w_comm: (
diff --git a/dlog/plonk/src/prover.rs b/dlog/plonk/src/prover.rs
index 2874666ea8..3f61944af9 100644
--- a/dlog/plonk/src/prover.rs
+++ b/dlog/plonk/src/prover.rs
@@ -434,7 +434,6 @@ where
 pub mod caml {
     use super::*;
     use commitment_dlog::commitment::caml::{CamlOpeningProof, CamlPolyComm};
-    use ocaml_gen::OcamlGen;
     use plonk_circuits::scalars::caml::CamlProofEvaluations;
 
     //
@@ -442,7 +441,7 @@ pub mod caml {
     //
 
     /// The ocaml type for ProverCommitments
-    #[derive(ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlProverCommitments<CamlG> {
         pub l_comm: CamlPolyComm<CamlG>,
         pub r_comm: CamlPolyComm<CamlG>,
@@ -487,7 +486,7 @@ pub mod caml {
     // ProverProof<G> <-> CamlProverProof<CamlG, CamlF>
     //
 
-    #[derive(ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlProverProof<CamlG, CamlF> {
         pub commitments: CamlProverCommitments<CamlG>,
         pub proof: CamlOpeningProof<CamlG, CamlF>,
diff --git a/ocaml/ocaml-gen/README.md b/ocaml/ocaml-gen/README.md
index 2ce5e594d8..3195c26e0e 100644
--- a/ocaml/ocaml-gen/README.md
+++ b/ocaml/ocaml-gen/README.md
@@ -49,44 +49,38 @@ decl_module!(w, env, "ImportantType", {
 To allow the previous example to work, you must derive the correct functions on your types and functions.
 To do that, you can use the [ocaml-derive](./derive) crate.
 
-To allow generation of bindings on structs, use [OCamlGen]():
+To allow generation of bindings on structs, use [Struct]():
 
 ```rust
-use ocaml_gen::OcamlGen;
-
-#[OcamlGen]
+#[ocaml_gen::Struct]
 struct MyType {
   // ...
 }
 ```
 
-To allow generation of bindings on enums, use [OcamlEnum]():
+To allow generation of bindings on enums, use [ocaml_gen::Enum]():
 
 ```rust
-use ocaml_gen::OcamlEnum;
-
-#[OcamlEnum]
+#[ocaml_gen::Enum]
 enum MyType {
   // ...
 }
 ```
 
-To allow generation of bindings on functions, use [ocaml_gen]():
+To allow generation of bindings on functions, use [ocaml_gen::func]():
 
 ```rust
-#[ocaml_gen]
+#[ocaml_gen::func]
 #[ocaml::func] // if you use the crate ocaml-rs' macro, it must appear after
 pub fn your_function(arg1: String) {
   //...
 }
 ```
 
-To allow generation of bindings on custom types, use [OCamlCustomType]():
+To allow generation of bindings on custom types, use [ocaml_gen::CustomType]():
 
 ```rust
-use ocaml_gen::OCamlCustomType;
-
-#[OCamlCustomType]
+#[ocaml_gen::CustomType]
 struct MyCustomType {
   // ...
 }
diff --git a/ocaml/ocaml-gen/derive/src/lib.rs b/ocaml/ocaml-gen/derive/src/lib.rs
index d848b278bf..5af3e0ecf7 100644
--- a/ocaml/ocaml-gen/derive/src/lib.rs
+++ b/ocaml/ocaml-gen/derive/src/lib.rs
@@ -19,7 +19,7 @@ use syn::{
 /// For example:
 ///
 /// ```
-/// #[ocaml_gen]
+/// #[ocaml_gen::func]
 /// #[ocaml::func]
 /// pub fn something(arg1: String) {
 ///   //...
@@ -27,7 +27,7 @@ use syn::{
 /// ```
 ///
 #[proc_macro_attribute]
-pub fn ocaml_gen(_attribute: TokenStream, item: TokenStream) -> TokenStream {
+pub fn func(_attribute: TokenStream, item: TokenStream) -> TokenStream {
     let item_fn: syn::ItemFn = syn::parse(item).unwrap();
 
     let rust_name = &item_fn.sig.ident;
@@ -94,27 +94,26 @@ pub fn ocaml_gen(_attribute: TokenStream, item: TokenStream) -> TokenStream {
 }
 
 //
-// OcamlEnum
+// Enum
 //
 
-/// The OcamlEnum derive macro.
+/// The Enum derive macro.
 /// It generates implementations of ToOCaml and OCamlBinding on an enum type.
 /// The type must implement [ocaml::IntoValue] and [ocaml::FromValue]
 /// For example:
 ///
 /// ```
-/// use ocaml_gen::OcamlEnum;
+/// use ocaml_gen::Enum;
 ///
-/// #[OcamlEnum]
+/// #[Enum]
 /// enum MyType {
 ///   // ...
 /// }
 /// ```
 ///
-#[proc_macro_derive(OcamlEnum)]
+#[proc_macro_derive(Enum)]
 pub fn derive_ocaml_enum(item: TokenStream) -> TokenStream {
-    let item_enum: syn::ItemEnum =
-        syn::parse(item).expect("only enum are supported with OcamlEnum");
+    let item_enum: syn::ItemEnum = syn::parse(item).expect("only enum are supported with Enum");
 
     //
     // ocaml_desc
@@ -346,27 +345,25 @@ pub fn derive_ocaml_enum(item: TokenStream) -> TokenStream {
 }
 
 //
-// OcamlGen
+// Struct
 //
 
-/// The OcamlGen derive macro.
+/// The Struct derive macro.
 /// It generates implementations of ToOCaml and OCamlBinding on a struct.
 /// The type must implement [ocaml::IntoValue] and [ocaml::FromValue]
 /// For example:
 ///
 /// ```
-/// use ocaml_gen::OcamlGen;
-///
-/// #[OcamlGen]
+/// #[ocaml_gen::Struct]
 /// struct MyType {
 ///   // ...
 /// }
 /// ```
 ///
-#[proc_macro_derive(OcamlGen)]
+#[proc_macro_derive(Struct)]
 pub fn derive_ocaml_gen(item: TokenStream) -> TokenStream {
     let item_struct: syn::ItemStruct =
-        syn::parse(item).expect("only structs are supported with OCamlGen");
+        syn::parse(item).expect("only structs are supported with Struct");
     let name = &item_struct.ident;
     let generics = &item_struct.generics.params;
     let fields = &item_struct.fields;
@@ -624,15 +621,15 @@ pub fn derive_ocaml_gen(item: TokenStream) -> TokenStream {
 /// For example:
 ///
 /// ```
-/// use ocaml_gen::OCamlCustomType;
+/// use ocaml_gen::CustomType;
 ///
-/// #[OCamlCustomType]
+/// #[CustomType]
 /// struct MyCustomType {
 ///   // ...
 /// }
 /// ```
 ///
-#[proc_macro_derive(OCamlCustomType)]
+#[proc_macro_derive(CustomType)]
 pub fn derive_ocaml_custom(item: TokenStream) -> TokenStream {
     let item_struct: syn::ItemStruct =
         syn::parse(item).expect("only structs are supported at the moment");
@@ -677,7 +674,7 @@ pub fn derive_ocaml_custom(item: TokenStream) -> TokenStream {
             if new_type {
                 let ty_name = rename.unwrap_or(#ocaml_name);
                 let ty_id = <Self as ::ocaml_gen::OCamlDesc>::unique_id();
-                env.new_custom_type(ty_id, ty_name);
+                env.new_type(ty_id, ty_name);
             }
 
             let name = <Self as ::ocaml_gen::OCamlDesc>::ocaml_desc(env, &[]);
diff --git a/ocaml/ocaml-gen/src/lib.rs b/ocaml/ocaml-gen/src/lib.rs
index 1ec3d9699c..6a439ead83 100644
--- a/ocaml/ocaml-gen/src/lib.rs
+++ b/ocaml/ocaml-gen/src/lib.rs
@@ -44,12 +44,6 @@ impl Env {
         };
     }
 
-    /// Declares a new custom type. Unlike [new_type] this can be called several times with the same type.
-    pub fn new_custom_type(&mut self, ty: u128, name: &'static str) {
-        self.locations
-            .insert(ty, (self.current_module.clone(), name));
-    }
-
     /// retrieves a type that was declared previously
     pub fn get_type(&self, ty: u128, name: &str) -> String {
         let (type_path, type_name) = self.locations.get(&ty).expect(&format!(
@@ -118,9 +112,9 @@ impl Env {
 //
 
 /// OCamlBinding is the trait implemented by types to generate their OCaml bindings.
-/// It is usually derived automatically via the [OcamlGen] macro,
-/// or the [OCamlCustomType] macro for custom types.
-/// For functions, refer to the [ocaml_gen] macro.
+/// It is usually derived automatically via the [Struct] macro,
+/// or the [CustomType] macro for custom types.
+/// For functions, refer to the [func] macro.
 pub trait OCamlBinding {
     /// will generate the OCaml bindings for a type (called root type).
     /// It takes the current environment [Env],
@@ -129,8 +123,8 @@ pub trait OCamlBinding {
 }
 
 /// OCamlDesc is the trait implemented by types to facilitate generation of their OCaml bindings.
-/// It is usually derived automatically via the [OcamlGen] macro,
-/// or the [OCamlCustomType] macro for custom types.
+/// It is usually derived automatically via the [Struct] macro,
+/// or the [CustomType] macro for custom types.
 pub trait OCamlDesc {
     /// describes the type in OCaml, given the current environment [Env]
     /// and the list of generic type parameters of the root type
diff --git a/ocaml/tests/src/lib.rs b/ocaml/tests/src/lib.rs
index 6420992aba..cd9a07b43b 100644
--- a/ocaml/tests/src/lib.rs
+++ b/ocaml/tests/src/lib.rs
@@ -1,13 +1,13 @@
-#[derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::OcamlGen)]
+#[derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
 pub struct SingleTuple(String);
 
-#[ocaml_gen::ocaml_gen]
+#[ocaml_gen::func]
 #[ocaml::func]
 pub fn new() -> SingleTuple {
     SingleTuple(String::from("Hello"))
 }
 
-#[ocaml_gen::ocaml_gen]
+#[ocaml_gen::func]
 #[ocaml::func]
 pub fn print(s: SingleTuple) {
     println!("{}", s.0);
diff --git a/oracle/src/sponge.rs b/oracle/src/sponge.rs
index 7fe73d5fd7..bc0d2724ad 100644
--- a/oracle/src/sponge.rs
+++ b/oracle/src/sponge.rs
@@ -215,13 +215,12 @@ where
 #[cfg(feature = "ocaml_types")]
 pub mod caml {
     use super::*;
-    use ocaml_gen::OcamlGen;
 
     //
     // ScalarChallenge<F> <-> CamlScalarChallenge<CamlF>
     //
 
-    #[derive(Debug, Clone, ocaml::IntoValue, ocaml::FromValue, OcamlGen)]
+    #[derive(Debug, Clone, ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Struct)]
     pub struct CamlScalarChallenge<CamlF>(pub CamlF);
 
     impl<F, CamlF> From<ScalarChallenge<F>> for CamlScalarChallenge<CamlF>