diff --git a/Modules/pyexpat.c b/Modules/pyexpat.c
index 184678a..7a0d035 100644
--- a/Modules/pyexpat.c
+++ b/Modules/pyexpat.c
@@ -535,7 +535,7 @@
 }
 
 static char xmlparse_ExternalEntityParserCreate__doc__[] = 
-"ExternalEntityParserCreate(context, encoding)\n\
+"ExternalEntityParserCreate(context[, encoding])\n\
 Create a parser for parsing an external entity based on the\n\
 information passed to the ExternalEntityRefHandler.";