doc: add osf version option to man page

Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/doc/primary-expression.txt b/doc/primary-expression.txt
index d819b24ca4346be850b9f5c78184e512e3cab18a..a62ed00eb3140aadefda531cdf0d497896a84d80 100644 (file)
--- a/doc/primary-expression.txt
+++ b/doc/primary-expression.txt
@@ -219,6 +219,8 @@ and others) from packets with the SYN bit set.
 |ttl|
 Do TTL checks on the packet to determine the operating system.|
 string
+|version|
+Do OS version checks on the packet.|
 |name|
 Name of the OS signature to match. All signatures can be found at pf.os file.
 Use "unknown" for OS signatures that the expression could not detect.|