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-rw-r--r--extensions/libipt_SET.man4
1 files changed, 4 insertions, 0 deletions
diff --git a/extensions/libipt_SET.man b/extensions/libipt_SET.man
index 0dce1c77..ea80c2a1 100644
--- a/extensions/libipt_SET.man
+++ b/extensions/libipt_SET.man
@@ -12,3 +12,7 @@ where flags are
and/or
.BR "dst"
specifications and there can be no more than six of them.
+.PP
+Use of -j SET requires that ipset kernel support is provided. As standard
+kernels do not ship this currently, the ipset or Xtables-addons package needs
+to be installed.