diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index e756c9aed..5e2aa6096 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -1946,8 +1946,8 @@ static inline int mbedtls_ssl_conf_tls13_is_some_psk_enabled(mbedtls_ssl_context
  * \param[in] ssl  SSL context
  * \param kex_modes_mask  Mask of the key exchange modes to check
  *
- * \return True, if at least one of the key exchange modes is supported,
- *         False, otherwise.
+ * \return Non-zero, if at least one of the key exchange modes is supported by
+ *         the peer, otherwise \0.
  */
 static inline int mbedtls_ssl_tls13_is_kex_mode_supported(mbedtls_ssl_context *ssl,
                                                           int kex_modes_mask)