1 files changed, 1 insertions, 1 deletions
diff --git a/qga/vss-win32/requester.h b/qga/vss-win32/requester.h
index 0a8d048874..34be5c1d11 100644
--- a/qga/vss-win32/requester.h
+++ b/qga/vss-win32/requester.h
@@ -27,7 +27,7 @@ typedef void (*ErrorSetFunc)(struct Error **errp, int win32_err,
                              const char *fmt, ...) GCC_FMT_ATTR(3, 4);
 typedef struct ErrorSet {
     ErrorSetFunc error_setg_win32;
-    struct Error **errp;
+    struct Error **errp;        /* restriction: must not be null */
 } ErrorSet;
 
 STDAPI requester_init(void);