diff --git a/keygen/README.md b/keygen/README.md
index 49e36b1..7f2c572 100644
--- a/keygen/README.md
+++ b/keygen/README.md
@@ -9,13 +9,13 @@ A Distributed Primary Key generator.
 Keygen id contains a table index in it's bit sequence, so we can locate the sharding table whitout the sharding key.
 For example, use Keygen id, we could use:
 
-```
+```sql
 select * from orders where id = 76362673717182593
 ```
 
 Use snowflake, you should use:
 
-```
+```sql
 select * from orders where id = 76362673717182593 and user_id = 100
 ```
 
diff --git a/keygen/README.zh-CN.md b/keygen/README.zh-CN.md
index 92c4a36..4cd6e25 100644
--- a/keygen/README.zh-CN.md
+++ b/keygen/README.zh-CN.md
@@ -9,13 +9,13 @@
 Keygen id 在其比特序列中包含了表索引，这样可以在没有分表键的情况下定位分表。
 例如，使用 Keygen id，我们可以：
 
-```
+```sql
 select * from orders where id = 76362673717182593
 ```
 
 使用雪花算法，则需要：
 
-```
+```sql
 select * from orders where id = 76362673717182593 and user_id = 100
 ```