DevelopmentModuleAPI.md

@@ -15,3 +15,16 @@ This function checks if *Readingname* `$name` is a valid format which consists o
 If the identifier starts with a dot `.`, it's considered to be an internal identifier and is treated differently in visualization, i.e. hidden.
 
 For valid identifiers a true value is returned, false otherwise. This function can be used in if-constructs directly to test whether a *Readingname* is valid or not.
+
+TODO:
+
+Clarify if
+
+```
+...
+.ätschbätsch
+///
+-aha-
+```
+
+are valid names, because in original FHEM code, they are which is probably a bug.