Closes #16657: fix docstring of traceback.format_tb().
diff --git a/Lib/traceback.py b/Lib/traceback.py
index eeb9e73..b13bfe2 100644
--- a/Lib/traceback.py
+++ b/Lib/traceback.py
@@ -71,7 +71,7 @@
         n = n+1
 
 def format_tb(tb, limit=None):
-    """A shorthand for 'format_list(extract_stack(f, limit))."""
+    """A shorthand for 'format_list(extract_tb(tb, limit))'."""
     return format_list(extract_tb(tb, limit))
 
 def extract_tb(tb, limit=None):