update readme, add warning about not reusing public keys

Author: ericpaulbishop

README.mkd

@@ -1,6 +1,6 @@
 # Redmine Git Hosting Plugin (v0.4.1)
 
-A ChiliProject/Redmine plugin which makes configuring your own git hosting easy. This plugin allows straightforward management
+A ChiliProject / Redmine plugin which makes configuring your own git hosting easy. This plugin allows straightforward management
 of gitolite and associated public keys, the git daemon, and integrates code from Scott Schacon's "grack" utility
 to provide Git Smart HTTP access.  Git repositories are automatically created when the repository is created in
 redmine.  There is also an option to automatically create a git repository for a project, when the project is created.
@@ -112,7 +112,10 @@ rails environment you have configured (e.g. production, development, testing).
 
 **(8)** Unless you want to access your repositories exclusively via Smart HTTP users will need to set a 
 public key to connect via SSH.  To do this, open a browser, login to ChiliProject/Redmine and follow the "My Account" Link
-in the upper right-hand corner of the page.  The right-hand column contains controls for adding your public key(s).
+in the upper right-hand corner of the page.  The right-hand column contains controls for adding your public key(s).  
+
+Keys should be unique, that is, the keys you set in ChiliProject / Redmine should not already exist in the gitolite repo.  In particular,
+do not re-use the key you set as the gitolite admin key.
 
 ## "Smart" HTTP Functionality