diff --git a/doc/management.txt b/doc/management.txt
index bd3622a..c7eb7ff 100644
--- a/doc/management.txt
+++ b/doc/management.txt
@@ -1776,6 +1776,17 @@
   'proc.' otherwise no variable will be found. This command requires levels
   "operator" or "admin".
 
+set var <name> <expression>
+  Allows to set or overwrite the process-wide variable 'name' with the result
+  of expression <expression>. Only process-wide variables may be used, so the
+  name must begin with 'proc.' otherwise no variable will be set. The
+  <expression> may only involve "internal" sample fetch keywords and converters
+  even though the most likely useful ones will be str('something') or int().
+  Note that the command line parser doesn't know about quotes, so any space in
+  the expression must be preceeded by a backslash. This command requires levels
+  "operator" or "admin". This command is only supported on a CLI connection
+  running in experimental mode (see "experimental-mode on").
+
 get weight <backend>/<server>
   Report the current weight and the initial weight of server <server> in
   backend <backend> or an error if either doesn't exist. The initial weight is