diff --git a/runtime/doc/Makefile b/runtime/doc/Makefile
index 83eb9e4..ad08a87 100644
--- a/runtime/doc/Makefile
+++ b/runtime/doc/Makefile
@@ -301,7 +301,7 @@
 # Use Vim to generate the tags file.  Can only be used when Vim has been
 # compiled and installed.  Supports multiple languages.
 vimtags: $(DOCS)
-	$(VIMEXE) -u NONE -esX -c "helptags ." -c quit
+	$(VIMEXE) -u NONE -esX -c "helptags ++t ." -c quit
 
 # Use "doctags" to generate the tags file.  Only works for English!
 tags: doctags $(DOCS)