diff --git a/docs/types.rst b/docs/types.rst
index e01e2f775..cf123055d 100644
--- a/docs/types.rst
+++ b/docs/types.rst
@@ -13,7 +13,7 @@ Solidity provides several elementary types which can be combined to form complex
 In addition, types can interact with each other in expressions containing
 operators. For a quick reference of the various operators, see :ref:`order`.
 
-The concept of "undefined" or "null" values do not exist in Solidity. To handle any unexpected values, you should use the :ref:`revert function<assert-and-require>` to revert the whole transaction.
+The concept of "undefined" or "null" values do not exist in Solidity. To handle any unexpected values, you should use the :ref:`revert function<assert-and-require>` to revert the whole transaction, or return a tuple with a second `bool` value denoting success.
 
 .. index:: ! value type, ! type;value