Update 31.markdown
:help match displays the help for the match() function, not the :match command.
    
        | author | Tyler Bindon <martica@martica.org> | 
    
        | date | Fri, 12 Apr 2013 18:15:45 -0600 | 
    
    
        | parents | 56683eb09ecc | 
    
        | children | dc530be684f2 | 
    
        | branches/tags | (none) | 
    
        | files | chapters/31.markdown | 
Changes
    
--- a/chapters/31.markdown	Thu Apr 04 01:38:14 2013 -0400
+++ b/chapters/31.markdown	Fri Apr 12 18:15:45 2013 -0600
@@ -184,7 +184,7 @@
 Read `:help pattern-overview` to see the kinds of things Vim regexes support.
 Stop reading after the character classes.
 
-Read `:help match`.  Try running the `:match Error /\v.../` command a few times
+Read `:help :match`.  Try running the `:match Error /\v.../` command a few times
 by hand.
 
 Edit your `~/.vimrc` file to add a mapping that will use `match` to highlight