Upper/lower case in heading

[Combs, Richard]

John Posada wrote: 
 
> I'm checking the content of another writer's documnt and it 
> appears he applies case in a random manner (but then maybe I 
> just don't see the logic). For instance, following are some 
> of the headings in a Release Note:
> 
> -Broker Might Be Inadvertently Uninstalled -Installation 
> Directories May not Contain Spaces -VPN Maps do not Increment 
> and Decrement Hops
> 
> It seems if the first one uses "Might Be", the next example 
> should be "May Not", not "May not", and if the second example 
> is "May not", isn't "do not" inconsistent?
> 
> My question...if I tell him to change any of them, and he 
> says Why?, what rule do I quote?

Two rules: 

1. In title case, capitalize all words except short prepositions,
conjuntions, and articles. 

2. Be consistent. 

HTH!
Richard