diff --git a/cmake/chapter-3/命令参数.cmake b/cmake/chapter-3/命令参数.cmake
index 731c486..3cbb1a5 100644
--- a/cmake/chapter-3/命令参数.cmake
+++ b/cmake/chapter-3/命令参数.cmake
@@ -7,6 +7,8 @@ set("a?b" "变量ab")
 
 ]]#
 
+message( a?b )
+
 message("${ab}")
 message(${a\?b})
 message("123455")