diff --git a/docs-2.0/3.ngql-guide/1.nGQL-overview/comments.md b/docs-2.0/3.ngql-guide/1.nGQL-overview/comments.md
index fcf8edf11f0..580303b76a2 100644
--- a/docs-2.0/3.ngql-guide/1.nGQL-overview/comments.md
+++ b/docs-2.0/3.ngql-guide/1.nGQL-overview/comments.md
@@ -2,10 +2,10 @@
 
 This topic will describe the comments in nGQL.
 
-## Legacy version compatibility
+!!! compatibility "Legacy version compatibility"
 
-* In Nebula Graph 1.x, there are four comment styles: `#`, `--`, `//`, `/* */`.
-* Since Nebula Graph 2.x, `--` cannot be used as comments.
+    * In Nebula Graph 1.x, there are four comment styles: `#`, `--`, `//`, `/* */`.
+    * Since Nebula Graph 2.x, `--` cannot be used as comments.
 
 ## Examples
 
diff --git a/docs-2.0/3.ngql-guide/1.nGQL-overview/identifier-case-sensitivity.md b/docs-2.0/3.ngql-guide/1.nGQL-overview/identifier-case-sensitivity.md
index 298ead41d1c..aa39726fa5a 100644
--- a/docs-2.0/3.ngql-guide/1.nGQL-overview/identifier-case-sensitivity.md
+++ b/docs-2.0/3.ngql-guide/1.nGQL-overview/identifier-case-sensitivity.md
@@ -7,7 +7,7 @@ The following statements will not work because they refer to two different space
 ```ngql
 nebula> CREATE SPACE IF NOT EXISTS my_space (vid_type=FIXED_STRING(30));
 nebula> use MY_SPACE;
-[ERROR (-8)]: SpaceNotFound:
+[ERROR (-1005)]: SpaceNotFound:
 ```
 
 ## Keywords and Reserved Words are Case-Insensitive
diff --git a/docs-2.0/3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md b/docs-2.0/3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md
index 0497824671e..7c82add3a0e 100644
--- a/docs-2.0/3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md
+++ b/docs-2.0/3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md
@@ -14,7 +14,7 @@ If you must use keywords in schema:
 
 ```ngql
 nebula> CREATE TAG TAG(name string);
-[ERROR (-7)]: SyntaxError: syntax error near `TAG'
+[ERROR (-1004)]: SyntaxError: syntax error near `TAG'
 
 nebula> CREATE TAG `TAG` (name string);
 Execution succeeded