update functions-and-recursion.md

Author: Chemaclass

content/documentation/functions-and-recursion.md

@@ -83,14 +83,28 @@ Each global function can take an optional doc comment and attribute map.
   "adds value a and b"
   [a b]
   (+ a b))
+```
+
+### Private functions
+
+Private functions are not exported from the namespace and cannot be accessed from other namespaces. You can create private functions in two ways:
 
+1. Using the `{:private true}` attribute map
+2. Using the `defn-` shorthand
+
+```phel
 (defn my-private-add-function
-  "adds value a and b"
   {:private true}
   [a b]
   (+ a b))
+  
+(defn- my-private-add-function 
+  [a b]
+  (+ a b))
 ```
 
+Both approaches are equivalent, but `defn-` provides a more concise syntax for defining private functions.
+
 ## Recursion
 
 Similar to `loop`, functions can be made recursive using `recur`.