From cb2835663d7c44e136393ecaffa64248ece756d8 Mon Sep 17 00:00:00 2001
From: chriseth <chris@ethereum.org>
Date: Wed, 11 Dec 2019 17:31:16 +0100
Subject: [PATCH] [DOC] Update interfaces

---
 docs/contracts/interfaces.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/docs/contracts/interfaces.rst b/docs/contracts/interfaces.rst
index 91e7d5947..69d4917cc 100644
--- a/docs/contracts/interfaces.rst
+++ b/docs/contracts/interfaces.rst
@@ -32,6 +32,11 @@ Interfaces are denoted by their own keyword:
 
 Contracts can inherit interfaces as they would inherit other contracts.
 
+All functions declared in interfaces are implicitly ``virtual``, which means that
+they can be overridden. This does not automatically mean that an overriding function
+can be overridden again - this is only possible if the overriding
+function is marked ``virtual``.
+
 Types defined inside interfaces and other contract-like structures
 can be accessed from other contracts: ``Token.TokenType`` or ``Token.Coin``.