Update prefer-case-to-elseif.md

Author: estevao-schultz-neto-SAP

docs/checks/prefer-case-to-elseif.md

@@ -6,6 +6,8 @@
 
 Prefer `CASE` to `ELSEIF` for multiple alternative conditions because `CASE` makes it easy to see a set of alternatives that exclude each other. It can be faster than a series of `IF`s because it can translate to a different microprocessor command instead of a series of subsequently evaluated conditions. You can introduce new cases quickly, without having to repeat the discerning variable over and over again. The statement even prevents some errors that can occur when accidentally nesting the `IF`-`ELSEIF`s.
 
+In short: If the IF-Statement has operations (like AND, OR, …) over several variables/attributes, it is not worthwhile to revert it to a CASE-Statement. In other words, conditions on multiple variables can be left in IF-statements. Only condition(s) on single variables should be converted to a CASE-Statement. 
+
 The threshold determines the maximum number of conditions.
 
 ### How to solve the issue?