diff --git a/README.md b/README.md
index 79f3305..366badb 100644
--- a/README.md
+++ b/README.md
@@ -80,6 +80,10 @@ steps:
 
 Outputs can be used in subsequent steps to comment on the pull request:
 
+> Notice: there's a limit to the number of characters inside a GitHub comment (65535).
+> Due to that limitation, you might end up with a failed workflow run even if the plan succeeded.
+> Another approach is to append your plan into the $GITHUB_JOB_SUMMARY environment variable which supports markdown.
+
 ```yaml
 defaults:
   run: