diff --git a/spec/Section 4 -- Composition.md b/spec/Section 4 -- Composition.md
index 8c24590..e3a311d 100644
--- a/spec/Section 4 -- Composition.md	
+++ b/spec/Section 4 -- Composition.md	
@@ -2830,7 +2830,7 @@ IsListType(type):
 
 - If {type} is a Non-Null type:
   - Let {innerType} be the inner type of {type}.
-  - Return {IsSingleObjectType(innerType)}.
+  - Return {IsListType(innerType)}.
 - Else if {type} is a List type:
   - Return true.
 - Else: