diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 9cdf3a3..a18edbb 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1403,8 +1403,14 @@
      * User settings
      */
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
-    char *hostname;             /*!< expected peer CN for verification
-                                     (and SNI if available)                 */
+    /** Expected peer CN for verification.
+     *
+     * Also used on clients for SNI.
+     *
+     * If this is \p NULL, the peer name verification is skipped, and
+     * the server_name extension is not sent.
+     */
+    char *hostname;
 #endif /* MBEDTLS_X509_CRT_PARSE_C */
 
 #if defined(MBEDTLS_SSL_ALPN)