diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 2ed3ec2..cd7c073 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1815,7 +1815,10 @@
 /**
  * \def MBEDTLS_SSL_DTLS_SRTP
  *
- * Enable support for DTLS-SRTP, RFC5764
+ * Enable support for DTLS-SRTP, RFC5764, use_srtp extension.
+ * \note Only the dtls-srtp key material negotiation is supported.
+ * Once negotiated, the key should be extracted, and data should be transmitted
+ * via an SRTP stack.
  *
  * Requires: MBEDTLS_SSL_PROTO_DTLS
  *