diff --git a/C/CounterMarking/Compat.toml b/C/CounterMarking/Compat.toml
new file mode 100644
index 0000000..e65d91b
--- /dev/null
+++ b/C/CounterMarking/Compat.toml
@@ -0,0 +1,13 @@
+[1]
+FileIO = "1"
+Glob = "1"
+Gtk4 = "0.7"
+GtkObservables = "2"
+ImageCore = "0.10"
+ImageIO = "0.6"
+ImageMorphology = "0.4"
+ImageSegmentation = "1.9.0-1"
+ImageView = "0.12"
+JLD2 = "0.5"
+XLSX = "0.10"
+julia = "1.10.0-1"
diff --git a/C/CounterMarking/Deps.toml b/C/CounterMarking/Deps.toml
new file mode 100644
index 0000000..bdf90a0
--- /dev/null
+++ b/C/CounterMarking/Deps.toml
@@ -0,0 +1,13 @@
+[1]
+FileIO = "5789e2e9-d7fb-5bc7-8068-2c6fae9b9549"
+Glob = "c27321d9-0574-5035-807b-f59d2c89b15c"
+Gtk4 = "9db2cae5-386f-4011-9d63-a5602296539b"
+GtkObservables = "8710efd8-4ad6-11eb-33ea-2d5ceb25a41c"
+ImageCore = "a09fc81d-aa75-5fe9-8630-4744c3626534"
+ImageIO = "82e4d734-157c-48bb-816b-45c225c6df19"
+ImageMorphology = "787d08f9-d448-5407-9aad-5290dd7ab264"
+ImageSegmentation = "80713f31-8817-5129-9cf8-209ff8fb23e1"
+ImageView = "86fae568-95e7-573e-a6b2-d8a6b900c9ef"
+JLD2 = "033835bb-8acc-5ee8-8aae-3f567f8a3819"
+Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+XLSX = "fdbf4ff8-1666-58a4-91e7-1b58723a45e0"
diff --git a/C/CounterMarking/Package.toml b/C/CounterMarking/Package.toml
new file mode 100644
index 0000000..1eee4ed
--- /dev/null
+++ b/C/CounterMarking/Package.toml
@@ -0,0 +1,3 @@
+name = "CounterMarking"
+uuid = "454fbcff-fa78-4492-9c80-2cfc3f2a4b52"
+repo = "git@github.com:HolyLab/CounterMarking.jl.git"
diff --git a/C/CounterMarking/Versions.toml b/C/CounterMarking/Versions.toml
new file mode 100644
index 0000000..e0d4f3e
--- /dev/null
+++ b/C/CounterMarking/Versions.toml
@@ -0,0 +1,2 @@
+["1.0.0"]
+git-tree-sha1 = "7f8e535058ad778d26fad0361a2a993fdd77a55d"
diff --git a/Registry.toml b/Registry.toml
index 84b4646..5eab989 100644
--- a/Registry.toml
+++ b/Registry.toml
@@ -33,6 +33,7 @@ register any package within lab scope.
 3c0dd727-6833-5f5d-a1e8-c0d421935c74 = { name = "RegisterMismatch", path = "R/RegisterMismatch" }
 43b7f2cc-1a9d-11e9-093e-178b9f97357d = { name = "ImagineProcedures", path = "I/ImagineProcedures" }
 45426be3-ce3a-4f7b-a429-3e2aa7698a5f = { name = "PhaseOptimizedComponentAnalysis", path = "P/PhaseOptimizedComponentAnalysis" }
+454fbcff-fa78-4492-9c80-2cfc3f2a4b52 = { name = "CounterMarking", path = "C/CounterMarking" }
 464fa2a9-b19c-5c59-8698-f58c971f971e = { name = "RegisterPenalty", path = "R/RegisterPenalty" }
 46a7138f-0d70-54e1-8ada-fb8296f91f24 = { name = "CenterIndexedArrays", path = "C/CenterIndexedArrays" }
 55325cc8-c0ec-11e8-2109-1f9bd277abf4 = { name = "ShotNoise", path = "S/ShotNoise" }