diff --git a/techlibs/cmos/cmos_cells.lib b/techlibs/cmos/cmos_cells.lib
index 697d8205..bf6b3478 100644
--- a/techlibs/cmos/cmos_cells.lib
+++ b/techlibs/cmos/cmos_cells.lib
@@ -1,3 +1,5 @@
+// test comment
+/* test comment */
 library(demo) {
   cell(BUF) {
     area: 6;