diff --git a/CMakeLists.txt b/CMakeLists.txt
index 36a1ca8..0def5e7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -99,7 +99,7 @@ endif()
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2")
 #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ggdb")
 
-# CYGWIN bug
+# CYGWIN or GCC 4.5.x bug
 if(CYGWIN)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=gnu++0x")
 else()