diff --git a/action.yml b/action.yml
index e763fd0..6520862 100644
--- a/action.yml
+++ b/action.yml
@@ -8,6 +8,7 @@ inputs:
 # Deprecated option, do not use. Will not be supported after October 1, 2019
   version:
     description: 'Deprecated. Use ruby-version instead. Will not be supported after October 1, 2019'
+    deprecationMessage: 'The version property will not be supported after October 1, 2019. Use ruby-version instead'
 runs:
   using: 'node12'
   main: 'lib/setup-ruby.js'