diff --git a/docs/developer_guides/chap02_schema.md b/docs/developer_guides/chap02_schema.md
index d7dbdd04bf..538f5ac9ad 100644
--- a/docs/developer_guides/chap02_schema.md
+++ b/docs/developer_guides/chap02_schema.md
@@ -24,7 +24,7 @@ type FieldSchema struct {
 	DataType     DataType
 	TypeParams   []*commonpb.KeyValuePair
 	IndexParams  []*commonpb.KeyValuePair
-  AutoID       bool
+    AutoID       bool
 }
 ```