diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 9cfb00c..c7a8e2f 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -2000,7 +2000,7 @@
  *                 here, except if using an event-driven style.
  *
  * \note           See also the "DTLS tutorial" article in our knowledge base.
- *                 https://tls.mbed.org/kb/how-to/dtls-tutorial
+ *                 https://mbed-tls.readthedocs.io/en/latest/kb/how-to/dtls-tutorial
  */
 void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl,
                                void *p_timer,