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-rw-r--r--doc/primary-expression.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/primary-expression.txt b/doc/primary-expression.txt
index f97778b9..4d6b0878 100644
--- a/doc/primary-expression.txt
+++ b/doc/primary-expression.txt
@@ -428,6 +428,10 @@ Destination address of the tunnel|
ipv4_addr/ipv6_addr
|=================================
+*Note:* When using xfrm_interface, this expression is not useable in output
+hook as the plain packet does not traverse it with IPsec info attached - use a
+chain in postrouting hook instead.
+
NUMGEN EXPRESSION
~~~~~~~~~~~~~~~~~