diff --git a/functions-and-operators/string-functions.md b/functions-and-operators/string-functions.md
index 95a07e99b33c1..fc7ec56e60ef4 100644
--- a/functions-and-operators/string-functions.md
+++ b/functions-and-operators/string-functions.md
@@ -2322,7 +2322,7 @@ Output:
 
 ## Regular expression compatibility with MySQL
 
-The following sections describe the regular expression compatibility with MySQL.
+The following sections describe the regular expression compatibility with MySQL, including `REGEXP_INSTR()`, `REGEXP_LIKE()`, `REGEXP_REPLACE()`, and `REGEXP_SUBSTR()`.
 
 ### Syntax compatibility
 
diff --git a/mysql-compatibility.md b/mysql-compatibility.md
index 4906d69ea1762..151d1d3d3f53a 100644
--- a/mysql-compatibility.md
+++ b/mysql-compatibility.md
@@ -276,6 +276,10 @@ The following column types are supported by MySQL but **not** by TiDB:
 
 - `SQL_TSI_*` (includes SQL_TSI_MONTH, SQL_TSI_WEEK, SQL_TSI_DAY, SQL_TSI_HOUR, SQL_TSI_MINUTE, and SQL_TSI_SECOND, but excludes SQL_TSI_YEAR)
 
+### Regular expressions
+
+For information about TiDB regular expression compatibility with MySQL, including `REGEXP_INSTR()`, `REGEXP_LIKE()`, `REGEXP_REPLACE()`, and `REGEXP_SUBSTR()`, see [Regular expression compatibility with MySQL](/functions-and-operators/string-functions.md#regular-expression-compatibility-with-mysql).
+
 ### Incompatibility due to deprecated features
 
 TiDB does not implement specific features deprecated in MySQL, including: