Defer to Vim's help for some gory details.
Thanks to @sedm0784 on GitHub for pointing this out.'
    
        | author | Steve Losh <steve@stevelosh.com> | 
    
        | date | Fri, 12 Oct 2012 19:50:04 -0400 | 
    
    
        | parents | ad477bf7ad4e | 
    
        | children | 49efcbc3a522 | 
    
        | branches/tags | (none) | 
    
        | files | chapters/11.markdown | 
Changes
    
--- a/chapters/11.markdown	Fri Oct 12 19:42:20 2012 -0400
+++ b/chapters/11.markdown	Fri Oct 12 19:50:04 2012 -0400
@@ -92,6 +92,9 @@
 Not all options can be used with `setlocal`.  To see if you can set a particular
 option locally, read its `:help`.
 
+We've glossed over a bit of detail about how local options *actually* work.  In
+the exercises you'll learn more about the gory details.
+
 Shadowing
 ---------
 
@@ -113,6 +116,8 @@
 Exercises
 ---------
 
+Read `:help local-options`.
+
 Read `:help setlocal`.
 
 Read `:help map-local`.