diff --git a/janitor/functions/summarize.py b/janitor/functions/summarize.py
index 95173b265..1544d6437 100644
--- a/janitor/functions/summarize.py
+++ b/janitor/functions/summarize.py
@@ -29,8 +29,6 @@ def summarize(
     It is a wrapper around `pd.DataFrame.agg`,
     with added flexibility for multiple columns.
 
-    The argument should be of the form `(columns, func, names_glue)`;
-    the `names_glue` argument is optional.
     `janitor.SD` allows for flexible column selection with the
     [`select_columns`][janitor.functions.select.select_columns]
     syntax.