---
doc/nft.txt | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/doc/nft.txt b/doc/nft.txt
index 7240deaa..f7a53ac9 100644
--- a/doc/nft.txt
+++ b/doc/nft.txt
@@ -170,17 +170,23 @@ SYMBOLIC VARIABLES
~~~~~~~~~~~~~~~~~~
[verse]
*define* 'variable' *=* 'expr'
+*undefine* 'variable'
+*redefine* 'variable' *=* 'expr'
*$variable*
Symbolic variables can be defined using the *define* statement. Variable
references are expressions and can be used to initialize other variables. The scope
of a definition is the current block and all blocks contained within.
+Symbolic variables can be undefined using the *undefine* statement, and modified
+using the *redefine* statement.
.Using symbolic variables
---------------------------------------
define int_if1 = eth0
define int_if2 = eth1
define int_ifs = { $int_if1, $int_if2 }
+redefine int_if2 = wlan0
+undefine int_if2
filter input iif $int_ifs accept
---------------------------------------
--
2.34.1
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