diff --git a/Changelog.md b/Changelog.md
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,7 @@
+# 0.1.2.4
+
+- Add `@since` Haddock annotations
+
 # 0.1.2.3
 
 - Remove internal ‘test-utils’ library which wasn’t supposed to be used by clients anyway but was confusing cabal dependency resolution
@@ -25,4 +29,4 @@
 
 # 0.1
 
-Initial release
+- Initial release
diff --git a/atomic-counter.cabal b/atomic-counter.cabal
--- a/atomic-counter.cabal
+++ b/atomic-counter.cabal
@@ -5,7 +5,7 @@
 name:
   atomic-counter
 version:
-  0.1.2.3
+  0.1.2.4
 synopsis:
   Mutable counters that can be modified with atomic operatinos
 
@@ -39,12 +39,13 @@
   GHC == 9.4,
   GHC == 9.6,
   GHC == 9.8,
-  GHC == 9.10
+  GHC == 9.10,
+  GHC == 9.12,
 
 build-type:
   Simple
 
-extra-source-files:
+extra-doc-files:
   Changelog.md
   Readme.md
 
diff --git a/src/Control/Concurrent/Counter/Lifted/IO.hs b/src/Control/Concurrent/Counter/Lifted/IO.hs
--- a/src/Control/Concurrent/Counter/Lifted/IO.hs
+++ b/src/Control/Concurrent/Counter/Lifted/IO.hs
@@ -71,6 +71,8 @@
 -- | Atomic compare and swap, i.e. write the new value if the current
 -- value matches the provided old value. Returns the value of the
 -- element before the operation
+--
+-- @since 0.1.2
 cas
   :: Counter
   -> Int -- ^ Expected old value
diff --git a/src/Control/Concurrent/Counter/Lifted/ST.hs b/src/Control/Concurrent/Counter/Lifted/ST.hs
--- a/src/Control/Concurrent/Counter/Lifted/ST.hs
+++ b/src/Control/Concurrent/Counter/Lifted/ST.hs
@@ -80,6 +80,8 @@
 -- | Atomic compare and swap, i.e. write the new value if the current
 -- value matches the provided old value. Returns the value of the
 -- element before the operation
+--
+-- @since 0.1.2
 cas
   :: Counter s
   -> Int -- ^ Expected old value
diff --git a/src/Control/Concurrent/Counter/Unlifted.hs b/src/Control/Concurrent/Counter/Unlifted.hs
--- a/src/Control/Concurrent/Counter/Unlifted.hs
+++ b/src/Control/Concurrent/Counter/Unlifted.hs
@@ -108,6 +108,8 @@
 -- | Atomic compare and swap, i.e. write the new value if the current
 -- value matches the provided old value. Returns the value of the
 -- element before the operation
+--
+-- @since 0.1.2
 foreign import prim "stg_casCounterzh"
   cas :: Counter s -> Int# -> Int# -> State# s -> (# State# s, Int# #)