diff --git a/lib/libc/gen/dup3.3 b/lib/libc/gen/dup3.3
--- a/lib/libc/gen/dup3.3
+++ b/lib/libc/gen/dup3.3
@@ -52,6 +52,8 @@
 bit in
 .Fa flags .
 .Pp
+The resolve-beneath flag on the new file descriptor is preserved.
+.Pp
 If
 .Fa oldd
 \*(Ne
diff --git a/lib/libsys/dup.2 b/lib/libsys/dup.2
--- a/lib/libsys/dup.2
+++ b/lib/libsys/dup.2
@@ -81,7 +81,10 @@
 additional
 .Xr open 2
 system call.
-The close-on-exec flag on the new file descriptor is unset.
+The close-on-exec and close-on-fork flags on the new file descriptor
+are unset.
+The resolve-beneath flag on the new file descriptor is set to the same
+state as on the old file descriptor.
 .Pp
 In
 .Fn dup2 ,