diff --git a/readme.md b/readme.md
index d14d73e10da..45c616ede5d 100644
--- a/readme.md
+++ b/readme.md
@@ -64,6 +64,9 @@ For rules support (requires pcre) use the flag.
 For release builds it is recommended that you use:
 -DUSE_MATCHCOMPILER=ON
 
+For building the tests use the flag.
+-DBUILD_TESTS=ON
+
 Using cmake you can generate project files for Visual Studio,XCode,etc.
 
 #### Building a specific configuration