diff --git a/INSTALL b/INSTALL
index 0927965..76572db 100644
--- a/INSTALL
+++ b/INSTALL
@@ -55,6 +55,8 @@ SCons command line options:
 	mandir=directory	where to install man pages. default autodetect
 	sysconfdir=directory	where to look for fspd and client configuration
 				files. Default prefix/etc
+	docdir=directory        where to put documentation.
+	                           Default prefix/share/doc/fsp
 	without-clients=yes     dont build and install client commands
 	dsssl=directory		Look for DocBook DSSSL Stylesheets there