diff --git a/man2/dup.2 b/man2/dup.2
index c3ad1368a..413183bc8 100644
--- a/man2/dup.2
+++ b/man2/dup.2
@@ -181,8 +181,10 @@ call was interrupted by a signal; see
 .RB ( dup3 ())
 .I flags
 contain an invalid value.
+.TP
+.B EINVAL
+.RB ( dup3 ())
 .\" FIXME . To confirm with Al Viro that this was intended, and its rationale
-Or,
 .I oldfd
 was equal to
 .IR newfd .