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+++ b/README.md
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 This is a small and portable implementation of the AES128 ECB encryption algorithm implemented in C.
 
+The API is very simple and looks like this (I am using stdint.h annotated types):
+
+
+    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);
+
+
 The module uses just a bit more than 200 bytes of RAM and 2.5K ROM when compiled for ARM (YMMV).
 
 It is the smallest implementation in C I've seen yet, but do contact me if you know of something smaller (or have improvements to the code here).