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bugpattern/TraditionalSwitchExpression.md

@@ -12,6 +12,13 @@ To make changes, edit the @BugPattern annotation or the explanation in docs/bugp
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+## The problem
+The newer arrow (`->`) syntax for switches is preferred to the older colon (`:`)
+syntax. The main reason for continuing to use the colon syntax in switch
+*statements* is that it allows fall-through from one statement group to the
+next. But in a switch *expression*, fall-through would only be useful if the
+code that falls through has side effects. Burying side effects inside a switch
+expression makes code hard to understand.
 
 ## Suppression
 Suppress false positives by adding the suppression annotation `@SuppressWarnings("TraditionalSwitchExpression")` to the enclosing element.