diff --git a/advisors/review_tool.py b/advisors/review_tool.py
index 4d36c25957c48126cc9cd759e3a93426dd5281d4..dccb2703bf3ceba8ad48f62930ea62925ddab5a7 100755
--- a/advisors/review_tool.py
+++ b/advisors/review_tool.py
@@ -361,7 +361,7 @@ def check_maintainer_changes():
     sigs = {}
     lst_files = subprocess.getoutput("git diff --name-status remotes/origin/master..")
     for line in lst_files.splitlines():
-        status, item = line.split()
+        status, item = line.split(maxsplit=1)
         if status != "M":
             continue
         if item.startswith("sig/") and item.endswith("/OWNERS"):
@@ -383,7 +383,7 @@ def check_sig_information_changes():
     sigs = {}
     lst_files = subprocess.getoutput("git diff --name-status remotes/origin/master..")
     for line in lst_files.splitlines():
-        status, item = line.split()
+        status, item = line.split(maxsplit=1)
         if status != "M":
             continue
         if item == "sig/sigs.yaml":
diff --git a/prow/prow_review_tool b/prow/prow_review_tool
index e2a25d0d85f8f7d0016437f86e02dffe7e80d87c..5334408774cecf50cb4bfcec7e4d3ce0c096bf76 100755
--- a/prow/prow_review_tool
+++ b/prow/prow_review_tool
@@ -52,8 +52,8 @@ if __name__ == '__main__':
     return_code = 0
     if args.payload:
         data = json.loads(args.payload)
-        if args.event == 'Merge Request Hook' and data['action'] == 'open' \
-                or data['action'] == 'update':
+        if args.event == 'Merge Request Hook' and data['action'] == 'open'\
+                or (data['action'] == 'update' and data['action_desc'] == "source_branch_changed"):
             subp = subprocess.run(["python3", get_cmd(),
                     "-u", data['pull_request']['html_url'], "-w", "/tmp/review_dir", "-c"],
                     stdout=subprocess.PIPE,
@@ -77,7 +77,7 @@ if __name__ == '__main__':
                         check=False)
                     return_code = subp.returncode
         else:
-            print("Event type: %s not support." % args.event)
+            print("prow_review_tool: this action type not need to process.")
     if return_code != 0:
         print(subp.stdout)
     sys.exit(return_code)