--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -355,14 +355,14 @@ class revlog(object):
fmt = v & 0xFFFF
if fmt == REVLOGV0:
if flags:
- raise RevlogError(_("index %s invalid flags %x for format v0")
+ raise RevlogError(_("index %s unknown flags %x for format v0")
% (self.indexfile, flags))
elif fmt == REVLOGNG:
if flags & ~REVLOGNGINLINEDATA:
- raise RevlogError(_("index %s invalid flags %x for revlogng")
+ raise RevlogError(_("index %s unknown flags %x for revlogng")
% (self.indexfile, flags))
else:
- raise RevlogError(_("index %s invalid format %d")
+ raise RevlogError(_("index %s unknown format %d")
% (self.indexfile, fmt))
self.version = v
if v == REVLOGV0: