Add notes to the documentation about CMAC_ALT algorithm support
Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index c3132a5..fc35427 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2615,6 +2615,11 @@
* Enable the CMAC (Cipher-based Message Authentication Code) mode for block
* ciphers.
*
+ * \note When #MBEDTLS_CMAC_ALT is active, meaning that the underlying
+ * implementation of the CMAC algorithm is provided by an alternate
+ * implementation, that alternate implementation may opt to not support
+ * AES-192 or 3DES as underlying block ciphers for the CMAC operation.
+ *
* Module: library/cmac.c
*
* Requires: MBEDTLS_AES_C or MBEDTLS_DES_C