diff --git a/examples/alembic_to_gltf/README.md b/examples/alembic_to_gltf/README.md
index 3188166..0d2d739 100644
--- a/examples/alembic_to_gltf/README.md
+++ b/examples/alembic_to_gltf/README.md
@@ -8,6 +8,7 @@
 
 * Alembic data with Ogawa backend only
 * Simple poly mesh only
+* Simple curve only
 * Static mesh only(Use first time sample. no animation)
 
 ## Compile
@@ -43,7 +44,7 @@ Here is an example JSON description of curves primitive.
             },
             "material": "material_1",
             "mode": 0,
-            "extra" {
+            "extras" {
               "ext_mode" : "curves"
             } 
           }