diff --git a/README.md b/README.md
index 175c242..86e47a9 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ This is a small and portable implementation of the AES128 ECB encryption algorit
 
 The API is very simple and looks like this (I am using stdint.h annotated types):
 
-```
+```C
 void AES128_ECB_encrypt(uint8_t* input, uint8_t* key, uint8_t *output);
 void AES128_ECB_decrypt(uint8_t* input, uint8_t* key, uint8_t *output);
 ```