diff --git a/doc/mytest.cfg b/doc/mytest.cfg
index 1385e493d4..db058b8f38 100644
--- a/doc/mytest.cfg
+++ b/doc/mytest.cfg
@@ -3,7 +3,8 @@
 
 [Common]
 cc=gcc     # '=' and ':' are the same
---foo="bar"   # '--cc' and 'cc' are the same, 'bar' and '"bar"' are the same
+--foo="bar"   # '--cc' and 'cc' are the same, 'bar' and '"bar"' are the same (except for '#')
+macrosym: "#"  # Note that '#' is interpreted as a comment without the quotation
 --verbose
 
 [Windows]