diff --git a/scripts/perf.py b/scripts/perf.py
index 01c8590c..023453d9 100755
--- a/scripts/perf.py
+++ b/scripts/perf.py
@@ -1290,8 +1290,8 @@ if __name__ == "__main__":
         nargs='?',
         type=lambda x: int(x, 0),
         const=0,
-        help="Depth of function calls to show. 0 shows all calls but may not "
-            "terminate!")
+        help="Depth of function calls to show. 0 shows all calls unless we "
+            "find a cycle. Defaults to 0.")
     parser.add_argument(
         '-t', '--hot',
         action='store_true',
diff --git a/scripts/perfbd.py b/scripts/perfbd.py
index 1a2ba31d..5e862242 100755
--- a/scripts/perfbd.py
+++ b/scripts/perfbd.py
@@ -1251,8 +1251,8 @@ if __name__ == "__main__":
         nargs='?',
         type=lambda x: int(x, 0),
         const=0,
-        help="Depth of function calls to show. 0 shows all calls but may not "
-            "terminate!")
+        help="Depth of function calls to show. 0 shows all calls unless we "
+            "find a cycle. Defaults to 0.")
     parser.add_argument(
         '-t', '--hot',
         action='store_true',
diff --git a/scripts/stack.py b/scripts/stack.py
index 9501ebdf..0c85b48b 100755
--- a/scripts/stack.py
+++ b/scripts/stack.py
@@ -794,8 +794,8 @@ if __name__ == "__main__":
         nargs='?',
         type=lambda x: int(x, 0),
         const=0,
-        help="Depth of function calls to show. 0 shows all calls but may not "
-            "terminate!")
+        help="Depth of function calls to show. 0 shows all calls unless we "
+            "find a cycle. Defaults to 0.")
     parser.add_argument(
         '-t', '--hot',
         action='store_true',