diff --git a/nexgb/xgbgen/go_union.go b/nexgb/xgbgen/go_union.go
index 1a8684c..74816d3 100644
--- a/nexgb/xgbgen/go_union.go
+++ b/nexgb/xgbgen/go_union.go
@@ -117,7 +117,7 @@ func (u *Union) Write(c *Context) {
 
 func (u *Union) WriteList(c *Context) {
 	c.Putln("// %sListBytes writes a list of %s values to a byte slice.",
-		u.SrcName())
+		u.SrcName(), u.SrcName())
 	c.Putln("func %sListBytes(buf []byte, list []%s) int {",
 		u.SrcName(), u.SrcName())
 	c.Putln("b := 0")
diff --git a/nexgb/xproto/xproto.go b/nexgb/xproto/xproto.go
index 1e5f4bb..0de64fd 100644
--- a/nexgb/xproto/xproto.go
+++ b/nexgb/xproto/xproto.go
@@ -1093,7 +1093,7 @@ func (v ClientMessageDataUnion) Bytes() []byte {
 	return buf
 }
 
-// ClientMessageDataUnionListBytes writes a list of %s(MISSING) values to a byte slice.
+// ClientMessageDataUnionListBytes writes a list of ClientMessageDataUnion values to a byte slice.
 func ClientMessageDataUnionListBytes(buf []byte, list []ClientMessageDataUnion) int {
 	b := 0
 	var unionBytes []byte