diff --git a/Tools/README.md b/Tools/README.md
index 63929bf9..24e567ea 100644
--- a/Tools/README.md
+++ b/Tools/README.md
@@ -19,7 +19,7 @@
   - GacGen
   - GlrParserGen
 
-**NOTE** Optimization is not turned on at this moment, tool performance could be slow especially for GacGen. You could change the makefile if you need to.
+**NOTE**: Optimization is not turned on at this moment, tool performance could be slow especially for GacGen. You could change the makefile if you need to.
 
 ## macOS