1 files changed, 5 insertions, 1 deletions

diff --git a/README.md b/README.md
index 0a28c8a..6a3aa58 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,18 @@
 ### Tiny AES128 in C
 
-This is a small and portable implementation of the AES128 ECB encryption algorithm written in C.
+This is a small and portable implementation of the AES128 ECB and CBC encryption algorithms written in C.
 
 The API is very simple and looks like this (I am using C99 `<stdint.h>`-style annotated types):
 
 ```C
 void AES128_ECB_encrypt(uint8_t* input, const uint8_t* key, uint8_t* output);
 void AES128_ECB_decrypt(uint8_t* input, const uint8_t* key, uint8_t* output);
+void AES128_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
+void AES128_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
 ```
 
+You can choose to use one or both of the modes-of-operation, by defining the symbols CBC and ECB. See the header file for clarification.
+
 The module uses around 200 bytes of RAM and 2.5K ROM when compiled for ARM (~2K for Thumb but 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).