1 files changed, 5 insertions, 2 deletions
diff --git a/docs/structure-of-a-contract.rst b/docs/structure-of-a-contract.rst
index df40b1d0..d57f1703 100644
--- a/docs/structure-of-a-contract.rst
+++ b/docs/structure-of-a-contract.rst
@@ -62,13 +62,16 @@ Function modifiers can be used to amend the semantics of functions in a declarat
 
 ::
 
-    pragma solidity ^0.4.11;
+    pragma solidity ^0.4.22;
 
     contract Purchase {
         address public seller;
 
         modifier onlySeller() { // Modifier
-            require(msg.sender == seller);
+            require(
+                msg.sender == seller,
+                "Only seller can call this."
+            );
             _;
         }