diff --git a/analyze/action.yml b/analyze/action.yml
index e4c6b9daec..b7880be179 100644
--- a/analyze/action.yml
+++ b/analyze/action.yml
@@ -58,7 +58,7 @@ inputs:
     # If changing this, make sure to update workflow.ts accordingly.
     default: ${{ github.workspace }}
   ref:
-    description: "The ref where results will be uploaded. If not provided, the Action will use the GITHUB_REF environment variable. If provided, the sha input must be provided as well. This input is ignored for pull requests from forks."
+    description: "The ref where results will be uploaded. If not provided, the Action will use the GITHUB_REF environment variable. If provided, the sha input must be provided as well. This input is ignored for pull requests from forks. Expected format: refs/heads/<branch name>, refs/tags/<tag>, refs/pull/<number>/merge, or refs/pull/<number>/head."
     required: false
   sha:
     description: "The sha of the HEAD of the ref where results will be uploaded. If not provided, the Action will use the GITHUB_SHA environment variable. If provided, the ref input must be provided as well. This input is ignored for pull requests from forks."
diff --git a/upload-sarif/action.yml b/upload-sarif/action.yml
index f4fd30f0c6..15ff9eeff3 100644
--- a/upload-sarif/action.yml
+++ b/upload-sarif/action.yml
@@ -14,7 +14,7 @@ inputs:
     required: false
     default: ${{ github.workspace }}
   ref:
-    description: "The ref where results will be uploaded. If not provided, the Action will use the GITHUB_REF environment variable. If provided, the sha input must be provided as well. This input is ignored for pull requests from forks."
+    description: "The ref where results will be uploaded. If not provided, the Action will use the GITHUB_REF environment variable. If provided, the sha input must be provided as well. This input is ignored for pull requests from forks. Expected format: refs/heads/<branch name>, refs/tags/<tag>, refs/pull/<number>/merge, or refs/pull/<number>/head."
     required: false
   sha:
     description: "The sha of the HEAD of the ref where results will be uploaded. If not provided, the Action will use the GITHUB_SHA environment variable. If provided, the ref input must be provided as well. This input is ignored for pull requests from forks."