Adding a couple of missing words so the sentence reads correctly.
    
        | author | Dave Bolton <david@davidbolton.net> | 
    
        | date | Tue, 29 Nov 2011 14:29:58 +1100 | 
    
    
        | parents | d96929307215 | 
    
        | children | 8d53ee8e7454 | 
    
        | branches/tags | (none) | 
    
        | files | chapters/18.markdown | 
Changes
    
--- a/chapters/18.markdown	Wed Nov 16 20:50:32 2011 -0500
+++ b/chapters/18.markdown	Tue Nov 29 14:29:58 2011 +1100
@@ -52,7 +52,7 @@
 FileType for this file and the autocommand only fires when that happens.  In the
 future you won't need to do it manually.
 
-Now lines before and after that autocommand group that look like this:
+Now add lines before and after that autocommand group so that it looks like this:
 
     " Vimscript file settings ---------------------- {{{
     augroup filetype_vim