diff --git a/action.yml b/action.yml
index 92afa17..6f35161 100644
--- a/action.yml
+++ b/action.yml
@@ -7,10 +7,8 @@ inputs:
     required: true
     default: ${{ github.repository }}
   ref:
-    description: 'Ref to checkout when version is not specified'
-    default: ${{ github.ref }}
-  version:
-    description: 'Commit SHA to checkout'
+    description: 'Ref to checkout (SHA, branch, tag)'
+    required: true
     default: ${{ github.version }}
   token:
     description: 'Access token for clone repository'
@@ -28,4 +26,4 @@ inputs:
     description: 'Optional path to check out source code'  
     default: 'foo/${{github.ref}}'
 runs:
-  plugin: 'checkout'
\ No newline at end of file
+  plugin: 'checkout'