Use :: only to reference constants

rubocop · May 5, 2013 · f657893 · f657893
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commit f657893
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diff --git a/README.md b/README.md
@@ -384,6 +384,20 @@ as easy to spots as regular comments.
 
 ## Syntax
 
+* Use `::` only to reference constants(this includes classes and
+modules). Never use `::` for method invocation.
+
+    ```Ruby
+    # bad
+    SomeClass::some_method
+    some_object::some_method
+
+    # good
+    SomeClass.some_method
+    some_object.some_method
+    SomeModule::SomeClass::SOME_CONST
+    ```
+
 * Use `def` with parentheses when there are arguments. Omit the
   parentheses when the method doesn't accept any arguments.