diff --git a/data-type-json.md b/data-type-json.md
index 2aa1a6c83653e..f562acd5bb4c3 100644
--- a/data-type-json.md
+++ b/data-type-json.md
@@ -7,6 +7,10 @@ aliases: ['/docs/dev/reference/sql/data-types/json/']
 
 # JSON Type
 
+> **Warning:**
+>
+> This is still an experimental feature. It is **NOT** recommended that you use it in the production environment.
+
 TiDB supports the `JSON` (JavaScript Object Notation) data type, which is useful for storing semi-structured data.  The `JSON` data type provides the following advantages over storing `JSON`-format strings in a string column:
 
 - Use the Binary format for serialization. The internal format permits quick read access to `JSON` document elements.
diff --git a/functions-and-operators/json-functions.md b/functions-and-operators/json-functions.md
index 8b70a7422de11..2eddfece4b8a7 100644
--- a/functions-and-operators/json-functions.md
+++ b/functions-and-operators/json-functions.md
@@ -7,6 +7,10 @@ aliases: ['/docs/dev/reference/sql/functions-and-operators/json-functions/']
 
 # JSON Functions
 
+> **Warning:**
+>
+> This is still an experimental feature. It is **NOT** recommended that you use it in the production environment.
+
 TiDB supports most of the JSON functions that shipped with the GA release of MySQL 5.7. Additional JSON functions were added to MySQL 5.7 after its release, and not all are available in TiDB (see [unsupported functions](#unsupported-functions)).
 
 ## Functions that create JSON values
diff --git a/generated-columns.md b/generated-columns.md
index d3538879aa275..67fc326b27082 100644
--- a/generated-columns.md
+++ b/generated-columns.md
@@ -7,6 +7,10 @@ aliases: ['/docs/dev/reference/sql/generated-columns/']
 
 # Generated Columns
 
+> **Warning:**
+>
+> This is still an experimental feature. It is **NOT** recommended that you use it in the production environment.
+
 TiDB supports generated columns as part of MySQL 5.7 compatibility. One of the primary use cases for generated columns is to extract data out of a JSON data type and enable it to be indexed.
 
 ## Index JSON using generated column
diff --git a/tidb-configuration-file.md b/tidb-configuration-file.md
index 2b497112cd192..54dd094ef2c89 100644
--- a/tidb-configuration-file.md
+++ b/tidb-configuration-file.md
@@ -353,6 +353,10 @@ Configuration items related to performance.
 
 The Plan Cache configuration of the `PREPARE` statement.
 
+> **Warning:**
+>
+> This is still an experimental feature. It is **NOT** recommended that you use it in the production environment.
+
 ### `enabled`
 
 - Determines whether to enable Plan Cache of the `PREPARE` statement.