diff --git a/README.md b/README.md
index 672dff5..7a3e3d3 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,9 @@
 `HANDBOOK_INSTALL_ROOT`
 This variable specifies the path to the top level directory on the web/deployment server, under which the files for this paper will be installed (that is, the directory that contains the individual paper directory hierarchies). On my machine this is set to `/Volumes/SHARED/Teaching/DatabaseCourses/Web_Deployment`, as the share gets mounted under `/Volumes/SHARED`. Under Windows this will be a UNC path which may require munging.
 
+`DBCOURSES_WEB_ROOT`
+This variable specifies the path to the top level directory of the Web server (e.g. `/mnt/info-nts-12/dbcourses`) being used to serve dynamic content (e.g. PHP scripts).  Currently this is limited to the timetable.php script.
+
 `XSLT`
 This variable specifies your preferred XSLT processor. Currently the valid options are `saxon` for SAXON 6.5.x, `saxon-b` for SAXON-B, `xalan-c` for the C++ implementation of Xalan and `xalan-j` for the Java implementation of Xalan (weirdly, the latter two have different command line options). For example, on my machine this is set to `saxon-b` (this is also the recommended setting, as the others don’t support XSLT 2.0 as well, if at all).