Merge pull request #195 from colemanomartin/patch-9

Update case_insensitivity.rst

config/instructions/case_insensitivity.rst

@@ -3,5 +3,8 @@ Case insensitivity in config files
 
 Setting names config files are case sensitive (starting with 0.50).
 In 0.17 to 0.33 settings were case insensitive but it caused many
-problems and thus has been dropped.
+problems and thus has been dropped. Generally, a safe approach is to 
+use only lower case in config files, though, it is fine to use upper
+case in slides.  Using lower case is recommended for naming 
+modes, devices, timers, etc....