diff --git a/doc/c64.sgml b/doc/c64.sgml
index c11867051..7cd9b2d81 100644
--- a/doc/c64.sgml
+++ b/doc/c64.sgml
@@ -225,6 +225,7 @@ declaration and usage.
 <item>cbm_save
 <item>cbm_write
 <item>get_tv
+<item>waitvsync
 </itemize>