diff --git a/Python/marshal.c b/Python/marshal.c
index 9688d426419c2fa..25353f6e6896249 100644
--- a/Python/marshal.c
+++ b/Python/marshal.c
@@ -1,8 +1,8 @@
 
 /* Write Python objects to files and read them back.
    This is primarily intended for writing and reading compiled Python code,
-   even though dicts, lists, sets and frozensets, not commonly seen in
-   code objects, are supported.
+   even though dicts and frozendicts, lists, sets and frozensets,
+   not commonly seen in code objects, are supported.
    Version 3 of this protocol properly supports circular links
    and sharing. */