diff --git a/action.yml b/action.yml
index a3b8799..4e98fdb 100644
--- a/action.yml
+++ b/action.yml
@@ -12,6 +12,8 @@ inputs:
     description: 'The id of the comment to update.'
   body:
     description: 'The comment body.'
+  file:
+    description: 'The path to a file that can be read as `body`. Use either `file` or `body`, but not both.'
   edit-mode:
     description: 'The mode when updating a comment, "replace" or "append".'
   reaction-type:
@@ -25,5 +27,5 @@ runs:
   using: 'node16'
   main: 'dist/index.js'
 branding:
-  icon: 'message-square'  
+  icon: 'message-square'
   color: 'gray-dark'