diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9c0985c..b72c863 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# v0.4.0
+## New features
+ * Support for Elm 0.18
+ * Dropped support for Elm 0.17
+
 # v0.3.0
 ## New features
  * Support for Elm 0.17
diff --git a/README.md b/README.md
index 799348d..4026a63 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,9 @@ Hackage: [elm-bridge](http://hackage.haskell.org/package/elm-bridge)
 
 Building the bridge from [Haskell](http://haskell.org) to [Elm](http://elm-lang.org) and back. Define types once, use on both sides and enjoy easy (de)serialisation. Cheers!
 
-Note that the [bartavelle/json-helpers](http://package.elm-lang.org/packages/bartavelle/json-helpers/latest/) package, with version >= 1.1.0, is expected by the generated Elm modules.
+This version of the package only supports Elm 0.18. Version 0.3.0.2 supports Elm 0.16 and Elm 0.17.
+
+Note that the [bartavelle/json-helpers](http://package.elm-lang.org/packages/bartavelle/json-helpers/latest/) package, with version >= 1.2.0, is expected by the generated Elm modules.
 
 ## Usage
 
diff --git a/elm-bridge.cabal b/elm-bridge.cabal
index 7602e3c..0c68fb7 100644
--- a/elm-bridge.cabal
+++ b/elm-bridge.cabal
@@ -3,6 +3,8 @@ version:             0.4.0
 synopsis:            Derive Elm types from Haskell types
 description:         Building the bridge from Haskell to Elm and back. Define types once,
                      use on both sides and enjoy easy (de)serialisation. Cheers!
+
+                     This module only supports Elm 0.18. Version 0.3.* supports both Elm 0.16 and Elm 0.17.
 homepage:            https://github.com/agrafix/elm-bridge
 license:             BSD3
 license-file:        LICENSE