diff --git a/lib/syntax.default b/lib/syntax.default
index 0d235f1dbf..62c4eea4d2 100644
--- a/lib/syntax.default
+++ b/lib/syntax.default
@@ -400,6 +400,8 @@ $$
 \bottomfraction
 \caption[]{}
 \cc{}
+\ce{}
+\cf{}
 \ccname
 \centering
 \centerline{translate}