diff --git a/aes.h b/aes.h
index 943dd8b..8100fba 100644
--- a/aes.h
+++ b/aes.h
@@ -45,8 +45,8 @@ void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
 
 #if defined(CTR) && (CTR == 1)
 
-/* Symmetrical operation: same function for encrypting as for decrypting */
-void AES_CTR_xcrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
+/* Symmetrical operation: same function for encrypting as for decrypting. Note any IV/nonce should never be reused with the same key */
+void AES_CTR_xcrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* nonce);
 
 #endif // #if defined(CTR) && (CTR == 1)