diff --git a/keccak_tiny.nim b/keccak_tiny.nim
index 2a414ca..f84e041 100644
--- a/keccak_tiny.nim
+++ b/keccak_tiny.nim
@@ -1,4 +1,7 @@
 {.compile: "keccak-tiny/keccak-tiny.c".}
+#Keccak-Tiny should be compiled for C99.
+#This statement checks to see if we're using a backend other then C, and if not, passes C99.
+#We would just check for C except Nim only defines the other backends.
 when not defined(cpp) or defined(objc) or defined(js):
     {.passC: "-std=c99".}