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-rw-r--r--share/man/man9/VOP_RDWR.91
1 files changed, 1 insertions, 0 deletions
diff --git a/share/man/man9/VOP_RDWR.9 b/share/man/man9/VOP_RDWR.9
index 4719ebabd094..2de7f9c9e7d2 100644
--- a/share/man/man9/VOP_RDWR.9
+++ b/share/man/man9/VOP_RDWR.9
@@ -83,6 +83,7 @@ Data already in VMIO space.
.El
.Sh LOCKS
The file should be locked on entry and will still be locked on exit.
+Rangelock covering the whole i/o range should be owned around the call.
.Sh RETURN VALUES
Zero is returned on success, otherwise an error code is returned.
.Sh ERRORS