Added the Doc/sgml/ directory to the tarball.
diff --git a/Doc/tools/sgmlconv/Makefile b/Doc/tools/sgmlconv/Makefile
index 7437933..6d87cc0 100644
--- a/Doc/tools/sgmlconv/Makefile
+++ b/Doc/tools/sgmlconv/Makefile
@@ -30,7 +30,7 @@
 	done
 
 tarball:  sgml
-	tar cf - tools/sgmlconv */*.sgml | gzip -9 >sgml-1.5.2b1.tgz
+	tar cf - sgml tools/sgmlconv */*.sgml | gzip -9 >sgml-1.5.2b1.tgz
 
 api:
 	cd api; $(MAKE) -f $(SGMLRULES) TOOLSDIR=../$(TOOLSDIR)