From f6c0edc902f2dabdf67c81435061038bfe3dce98 Mon Sep 17 00:00:00 2001
From: Nobuhiko Otoba <44864310+nobutoba@users.noreply.github.com>
Date: Mon, 25 Apr 2022 11:10:23 +0900
Subject: [PATCH] Add a require statement to the Ballot contract

---
 docs/examples/voting.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/examples/voting.rst b/docs/examples/voting.rst
index 0e8901c3d..a51c01b74 100644
--- a/docs/examples/voting.rst
+++ b/docs/examples/voting.rst
@@ -109,6 +109,7 @@ of votes.
         function delegate(address to) external {
             // assigns reference
             Voter storage sender = voters[msg.sender];
+            require(sender.weight != 0, "You have no right to vote");
             require(!sender.voted, "You already voted.");
 
             require(to != msg.sender, "Self-delegation is disallowed.");