Index: INSTALL.txt
===================================================================
RCS file: /cvs/drupal/drupal/INSTALL.txt,v
retrieving revision 1.76
diff -u -p -r1.76 INSTALL.txt
--- INSTALL.txt	14 Sep 2009 07:33:55 -0000	1.76
+++ INSTALL.txt	13 Jan 2010 22:18:00 -0000
@@ -319,6 +319,18 @@ setup for a configuration such as this w
   sites/sub.example.com/settings.php
   sites/sub.example.com.site3/settings.php
 
+For sites that are installed in subdirectories, it is likely you will need to
+create a symbolic link to that directory name from the root level of your
+Drupal installation. For example, for a site configured at
+sites/example.com.site3/settings.php you would create the following symbolic
+link from within the root directory of your Drupal installation:
+ 
+  ln -s . site3
+
+Note this is created as "site3" (not example.com.site3) and that it links
+to its own parent directory, the root directory of the Drupal installation;
+the symbolic link is not to the sites/example.com.site3 directory.
+
 When searching for a site configuration (for example www.sub.example.com/site3),
 Drupal will search for configuration files in the following order, using the
 first configuration it finds: