diff --git a/doc/build/Compilation.texi b/doc/build/Compilation.texi
index 00e58622..10bf1219 100644
--- a/doc/build/Compilation.texi
+++ b/doc/build/Compilation.texi
@@ -449,6 +449,12 @@ Specific to @sc{Window Maker}, this option defines an additional path where @emp
 searched. Nothing will be installed there; the default path taken is @file{@emph{DATADIR}/pixmaps},
 where @var{DATADIR} is the path defined from @option{--datadir}.
 
+@item --with-defsdatadir=@i{DIR}
+Specific to @sc{Window Maker}, defines the directory where system configuration
+files, e.g., @file{WindowMaker}, @file{WMRootMenu}, etc., are installed.  The
+default value is @file{@emph{SYSCONFDIR}/WindowMaker}, where @var{SYSCONFDIR} is
+the path defined from @option{--sysconfdir}.
+
 @end table