Bind a global variable with let instead of set
    
        | author | Eduardo Lopez Biagi <eduardo.biagi@gmail.com> | 
    
        | date | Sun, 30 Dec 2012 09:48:17 -0600 | 
    
    
        | parents | 0e78ce34b11d | 
    
        | children | 85ea6213b42a | 
    
        | branches/tags | (none) | 
    
        | files | chapters/52.markdown | 
Changes
    
--- a/chapters/52.markdown	Mon Nov 19 19:01:14 2012 -0500
+++ b/chapters/52.markdown	Sun Dec 30 09:48:17 2012 -0600
@@ -33,7 +33,7 @@
 if that variable isn't already set.  We've seen this kind of check before.
 
 This will allow users to override it if `potion` isn't in their `$PATH` by
-putting a line like `set g:potion_command = "/Users/sjl/src/potion/potion"` in
+putting a line like `let g:potion_command = "/Users/sjl/src/potion/potion"` in
 their `~/.vimrc` file.
 
 The last line adds a buffer-local mapping that calls a function we've defined
@@ -270,7 +270,7 @@
         call append(0, split(bytecode, '\v\n'))
     endfunction
 
-The `append()` Vim function take two arguments: a line number to append after,
+The `append()` Vim function takes two arguments: a line number to append after,
 and a list of Strings to append as lines.  For example, try running the
 following command: