diff --git a/http.c b/http.c
index e978565..3db9512 100644
--- a/http.c
+++ b/http.c
@@ -228,6 +228,7 @@ static CURL * g_http_handle = NULL;
 static int
 http_progress_callback(void *clientp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow)
 {
+	/* Check the PgSQL global flags */
 	return QueryCancelPending || ProcDiePending;
 }