Update Reference.md

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@ -266,7 +266,7 @@ To invoke this command from the CLI, preface the single-letter name *c* with '@'
To create more than one user-defined command, simply create multiple instances of SpanUserCommand, each with its own single-letter name. Note that re-using the same single-letter name in an instance of SpanUserCommand over-rides any previous instances using that same letter.
## *#define REQUIRED VERSION(major,minor,patch)*
### *#define REQUIRED VERSION(major,minor,patch)*
If REQUIRED is defined in the main sketch prior to including the HomeSpan library with `#include "HomeSpan.h"`, HomeSpan will throw a compile-time error unless the version of the library included is equal to, or later than, the version specified using the VERSION macro. Example: