Update readme about keeping temp files

README.md

@@ -18,13 +18,19 @@ Download and run the installation script
 Usage
 -----
 
-    sudo crew <command> <package>
+    sudo crew <command> <package> <keep[temporary files]>
 
 Where available commands are:
   
   * search [looks for a package]
-  * download [downloads a package to CREW_BREW_DIR(/usr/local/tmp/cbrew by default), but doesn't install it]
+  * download [downloads a package to CREW_BREW_DIR (/usr/local/tmp/crew by default), but doesn't install it]
   * install [installs a package along with its dependencies. You'll be prompted for confirmation, must be ran as root]
   * remove [removes a package. Must be ran as root]
   
-Available packages are listed in the [packages directory](https://github.com/skycocker/chromebrew/tree/master/packages). 
+Available packages are listed in the [packages directory](https://github.com/skycocker/chromebrew/tree/master/packages).
+
+Chromebrew will wipe its BREW_DIR (/usr/local/tmp/crew by default) after installation unless you pass "keep" as the last parameter when running "crew install".
+
+    crew install <package> keep
+
+