README.md in option-0.4.0 vs README.md in option-0.5.0

@@ -55,11 +55,16 @@
 None.fold(-> { "missing" }) { |v| v.upcase } #=> missing
 
 # filter values returning an option
 foo.filter { |v| v == "baz" } #=> None
 
-# mutation
+# Side-effects
 foo.inside { |v| v.upcase! } #=> Some("BAR")
+
+# use in a for loop
+for value in foo
+  puts value #=> bar
+end
 ```
 
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