diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index f4ad69d1d..2d017d1ce 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -27,7 +27,9 @@
 // The version config.
 #define VERSION_MAJOR       3
 #define VERSION_MINOR       0
+// Version for SRS3.
 #define SRS3_VERSION_REVISION    111
+// Version we used.
 #define VERSION_REVISION SRS3_VERSION_REVISION
 
 // The macros generated by configure script.