diff --git a/docs/source/example-code/src/main/kotlin/net/corda/docs/tutorial/twoparty/contract.kt b/docs/source/example-code/src/main/kotlin/net/corda/docs/tutorial/twoparty/contract.kt
index 05fb4af8bd..97f45ede59 100644
--- a/docs/source/example-code/src/main/kotlin/net/corda/docs/tutorial/twoparty/contract.kt
+++ b/docs/source/example-code/src/main/kotlin/net/corda/docs/tutorial/twoparty/contract.kt
@@ -9,9 +9,11 @@ import net.corda.core.transactions.LedgerTransaction
 import net.corda.core.contracts.*
 
 // Replace IOUContract's contract ID and definition with:
-val IOU_CONTRACT_ID = "com.template.IOUContract"
-
 class IOUContract : Contract {
+    companion object {
+        val ID = "com.template.IOUContract"
+    }
+    
     // Our Create command.
     class Create : CommandData
 
@@ -35,4 +37,4 @@ class IOUContract : Contract {
         }
     }
 }
-// DOCEND 01
\ No newline at end of file
+// DOCEND 01