diff --git a/doc/manager/iscan.htm b/doc/manager/iscan.htm
index d52f4dd4..caa4f0a9 100644
--- a/doc/manager/iscan.htm
+++ b/doc/manager/iscan.htm
@@ -57,6 +57,11 @@ different parameters.
 <DD>This command adds the variable specified by the argument name to the
 list of variables scanned in the next scan. The arguments start and step
 define the starting point and the sptep width for the scan on this variable.
+<dt>xxxscan log var
+<dd>This command adds a variable to be logged during the scan. Can be slave 
+ motors such as stt, om, chi, phi during four circle work. These variables
+ are not driven, just logged. var is the SICS variable to log. Only drivable
+ parameters may be logged in such a way. 
 <DT>xxscan run NP mode preset
 <DD>Executes a scan. The arguments are: NP the number of scan points, mode
 the counter mode to use (this can be either timer or monitor) and preset