diff --git a/spec/Section 5 -- Validation.md b/spec/Section 5 -- Validation.md
index 718924814..17c703987 100644
--- a/spec/Section 5 -- Validation.md	
+++ b/spec/Section 5 -- Validation.md	
@@ -586,6 +586,7 @@ fragment commandFragment($command: DogCommand!) on Dog {
 
 fragment potentiallyConflictingArguments(
   $commandOne: DogCommand!
+  $commandTwo: DogCommand!
 ) on Dog {
   ...commandFragment(command: $commandOne)
   ...commandFragment(command: $commandTwo)