diff --git a/README.md b/README.md
index 334614e..82ebb0c 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 # Build
+For MacOS:
 `make`
 
+For other platforms modify flags in the Makefile.
+
 # Run
 `./pingpong`