diff --git a/hclsyntax/spec.md b/hclsyntax/spec.md
index 21212fab..6d31e352 100644
--- a/hclsyntax/spec.md
+++ b/hclsyntax/spec.md
@@ -268,10 +268,10 @@ collection value.
 ```ebnf
 CollectionValue = tuple | object;
 tuple = "[" (
-    (Expression ("," Expression)* ","?)?
+    (Expression (("," | Newline) Expression)* ","?)?
 ) "]";
 object = "{" (
-    (objectelem ("," objectelem)* ","?)?
+    (objectelem (( "," | Newline) objectelem)* ","?)?
 ) "}";
 objectelem = (Identifier | Expression) ("=" | ":") Expression;
 ```