diff --git a/mullvad-api/include/mullvad-api.h b/mullvad-api/include/mullvad-api.h
index ff724c07ded4..4e5f78aef28b 100644
--- a/mullvad-api/include/mullvad-api.h
+++ b/mullvad-api/include/mullvad-api.h
@@ -53,6 +53,7 @@ typedef struct MullvadApiDevice {
  *
  * * `hostname`: pointer to a null-terminated UTF-8 string representing the hostname that will be
  *   used for TLS validation.
+ * * `disable_tls`: only valid when built for tests, can be ignored when consumed by Swift.
  */
 struct MullvadApiError mullvad_api_client_initialize(struct MullvadApiClient *client_ptr,
                                                      const char *api_address_ptr,