         _ -> "Will match"
       end
       #=> "Will match"
+
+  ## Using guards to match against multiple values
+
+  While it is not possible to match against multiple patterns in a single
+  clause, it's possible to match against multiple values by using guards:
+
+      case data do
+        value when value in [:one, :two] ->
+          "#{value} has been matched"
+
+        :three ->
+          "three has been matched"
+      end
 
   """
   defmacro case(condition, clauses), do: error!([condition, clauses])

      case x do
        0 ->
          "This clause won't match"
        _ ->
          "This clause would match any value (x = #{x})"
      end

      value
      #=> unbound variable value

  Variables in the outer context cannot be overridden either:

      value = 7

