diff --git a/misc/factor.vim.fgen b/misc/factor.vim.fgen
index 7dcf59142d..e119edcf3d 100644
--- a/misc/factor.vim.fgen
+++ b/misc/factor.vim.fgen
@@ -12,7 +12,7 @@ IN: factor.vim.fgen
 " Vim syntax file
 " Language: Factor
 " Maintainer: Alex Chapman <chapman.alex@gmail.com>
-" Last Change: 2011 Mar 21
+" Last Change: 2011 Apr 04
 " To run: USING: html.templates html.templates.fhtml ; "resource:misc/factor.vim.fgen" <fhtml> call-template
 
 " For version 5.x: Clear all syntax items
@@ -128,7 +128,7 @@ syn match   factorDefer         /\<DEFER:\s\+\S\+\>/
 syn match   factorForget        /\<FORGET:\s\+\S\+\>/
 syn match   factorMixin         /\<MIXIN:\s\+\S\+\>/
 syn match   factorInstance      /\<INSTANCE:\s\+\S\+\s\+\S\+\>/
-syn match   factorHook          /\<HOOK:\s\+\S\+\s\+\S\+\>/
+syn match   factorHook          /\<HOOK:\s\+\S\+\s\+\S\+\>/ nextgroup=factorStackEffect skipwhite skipempty
 syn match   factorMain          /\<MAIN:\s\+\S\+\>/
 syn match   factorConstructor   /\<C:\s\+\S\+\s\+\S\+\>/
 syn match   factorAlien         /\<ALIEN:\s\+[0-9a-fA-F]\([0-9a-fA-F,]*[0-9a-fA-F]\)\?\>/
diff --git a/misc/vim/syntax/factor.vim b/misc/vim/syntax/factor.vim
index e2e2355436..ef648f8209 100644
--- a/misc/vim/syntax/factor.vim
+++ b/misc/vim/syntax/factor.vim
@@ -1,7 +1,7 @@
 " Vim syntax file
 " Language: Factor
 " Maintainer: Alex Chapman <chapman.alex@gmail.com>
-" Last Change: 2011 Mar 21
+" Last Change: 2011 Apr 04
 " To run: USING: html.templates html.templates.fhtml ; "resource:misc/factor.vim.fgen" <fhtml> call-template
 
 " For version 5.x: Clear all syntax items