diff --git a/README.md b/README.md
index b7ef2dd..7847710 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ This is Ripple's bancho server. It handles:
 ## Requirements
 - Python 3.5
 - Cython
+- C compiler
 - MySQLdb (`mysqlclient`)
 - Tornado
 - Bcrypt