diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index bef6341..ad60e82 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1785,36 +1785,35 @@
 #if !defined(MBEDTLS_SSL_CONF_SET_TIMER) && \
     !defined(MBEDTLS_SSL_CONF_GET_TIMER)
 /**
- * \brief          Set the timer callbacks (Mandatory for DTLS.)
+ * \brief         Set the timer callbacks (Mandatory for DTLS.)
  *
- * \param ssl      SSL context
- * \param p_timer  parameter (context) shared by timer callbacks
+ * \param ssl     SSL context
+ * \param p_timer parameter (context) shared by timer callbacks
  * \param f_set_timer   set timer callback
  * \param f_get_timer   get timer callback. Must return:
  *
- * \note           See the documentation of \c mbedtls_ssl_set_timer_t and
- *                 \c mbedtls_ssl_get_timer_t for the conventions this pair of
- *                 callbacks must follow.
+ * \note          See the documentation of \c mbedtls_ssl_set_timer_t and
+ *                \c mbedtls_ssl_get_timer_t for the conventions this pair of
+ *                callbacks must follow.
  *
- * \note           On some platforms, timing.c provides
- *                 \c mbedtls_timing_set_delay() and
- *                 \c mbedtls_timing_get_delay() that are suitable for using
- *                 here, except if using an event-driven style.
+ * \note          On some platforms, timing.c provides
+ *                \c mbedtls_timing_set_delay() and
+ *                \c mbedtls_timing_get_delay() that are suitable for using
+ *                here, except if using an event-driven style.
  *
- * \note           On constrained systems, the timer callbacks \p f_set_timer
- *                 and \p f_get_timer may also be configured at compile-time
- *                 via MBEDTLS_SSL_CONF_GET_TIMER and MBEDTLS_SSL_CONF_SET_TIMER.
- *                 In this case, the corresponding arguments to this function
- *                 are ignored.
+ * \note          On constrained systems, the timer callbacks \p f_set_timer
+ *                and \p f_get_timer may also be configured at compile-time
+ *                via MBEDTLS_SSL_CONF_GET_TIMER and MBEDTLS_SSL_CONF_SET_TIMER.
  *
- * \note           See also the "DTLS tutorial" article in our knowledge base.
- *                 https://tls.mbed.org/kb/how-to/dtls-tutorial
+ * \note          See also the "DTLS tutorial" article in our knowledge base.
+ *                https://tls.mbed.org/kb/how-to/dtls-tutorial
  */
 void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl,
                                void *p_timer,
                                mbedtls_ssl_set_timer_t *f_set_timer,
                                mbedtls_ssl_get_timer_t *f_get_timer );
-#else
+#else /* !( MBEDTLS_SSL_CONF_SET_TIMER &&
+            MBEDTLS_SSL_CONF_GET_TIMER ) */
 /**
  * \brief          Set the context to be passed to the timer callbacks
  *                 (Mandatory for DTLS.)
@@ -1825,7 +1824,8 @@
  */
 void mbedtls_ssl_set_timer_cb_ctx( mbedtls_ssl_context *ssl,
                                    void *p_timer );
-#endif
+#endif /* MBEDTLS_SSL_CONF_SET_TIMER &&
+          MBEDTLS_SSL_CONF_GET_TIMER */
 
 /**
  * \brief           Callback type: generate and write session ticket