diff --git a/pr_agent/test_files/mock_pr_agent.py b/pr_agent/test_files/mock_pr_agent.py
index 0a691969..6fc539d4 100644
--- a/pr_agent/test_files/mock_pr_agent.py
+++ b/pr_agent/test_files/mock_pr_agent.py
@@ -24,7 +24,7 @@
     # Agent instructions
     instructions="""
     You are a helpful PR sumary agent to test github integration.
-    Input: A git diff output, showing all changes in the branch.
+    Input: A git diff output, showing all changes in the branch about to be merged.
     Create a short PR summary.
 
     If the input does not exist, always output an error message instead.