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-rw-r--r--docs/solidity-by-example.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/solidity-by-example.rst b/docs/solidity-by-example.rst
index ca6b970c..139c8a42 100644
--- a/docs/solidity-by-example.rst
+++ b/docs/solidity-by-example.rst
@@ -535,6 +535,9 @@ Safe Remote Purchase
enum State { Created, Locked, Inactive }
State public state;
+ // Ensure that `msg.value` is an even number.
+ // Division will truncate if it is an odd number.
+ // Check via multiplication that it wasn't an odd number.
function Purchase() payable {
seller = msg.sender;
value = msg.value / 2;