diff --git a/redo/dialog_darwin.m b/redo/dialog_darwin.m
index 98b2ae8..3e662be 100644
--- a/redo/dialog_darwin.m
+++ b/redo/dialog_darwin.m
@@ -25,5 +25,6 @@ char *openFile(void)
 	dispatch_resume(dispatch_get_main_queue());
 	if (ret != NSFileHandlingPanelOKButton)
 		return NULL;
+	// string freed on the Go side
 	return strdup([[[op URL] path] UTF8String]);
 }