diff --git a/develop/dev-guide-sample-application-ruby-mysql2.md b/develop/dev-guide-sample-application-ruby-mysql2.md
index fae95d233cec0..92529bf2bc0f5 100644
--- a/develop/dev-guide-sample-application-ruby-mysql2.md
+++ b/develop/dev-guide-sample-application-ruby-mysql2.md
@@ -99,15 +99,15 @@ Connect to your TiDB cluster depending on the TiDB deployment option you've sele
     cp .env.example .env
     ```
 
-6. Edit the `.env` file, set up the environment variables as follows, and replace the corresponding placeholders `<>` with connection parameters in the connection dialog:
+6. Edit the `.env` file, set up the environment variables as follows, and replace the corresponding placeholders `{}` with connection parameters in the connection dialog:
 
     ```dotenv
-   DATABASE_HOST=<host>
-   DATABASE_PORT=4000
-   DATABASE_USER=<user>
-   DATABASE_PASSWORD=<password>
-   DATABASE_NAME=test
-   DATABASE_ENABLE_SSL=true
+    DATABASE_HOST={host}
+    DATABASE_PORT=4000
+    DATABASE_USER={user}
+    DATABASE_PASSWORD={password}
+    DATABASE_NAME=test
+    DATABASE_ENABLE_SSL=true
     ```
 
    > **Note**
@@ -133,16 +133,16 @@ Connect to your TiDB cluster depending on the TiDB deployment option you've sele
     cp .env.example .env
     ```
 
-5. Edit the `.env` file, set up the environment variables as follows, and replace the corresponding placeholders `<>` with connection parameters in the connection dialog:
+5. Edit the `.env` file, set up the environment variables as follows, and replace the corresponding placeholders `{}` with connection parameters in the connection dialog:
 
     ```dotenv
-    DATABASE_HOST=<host>
+    DATABASE_HOST={host}
     DATABASE_PORT=4000
-    DATABASE_USER=<user>
-    DATABASE_PASSWORD=<password>
+    DATABASE_USER={user}
+    DATABASE_PASSWORD={password}
     DATABASE_NAME=test
     DATABASE_ENABLE_SSL=true
-    DATABASE_SSL_CA=<downloaded_ssl_ca_path>
+    DATABASE_SSL_CA={downloaded_ssl_ca_path}
     ```
 
    > **Note**
@@ -162,13 +162,13 @@ Connect to your TiDB cluster depending on the TiDB deployment option you've sele
     cp .env.example .env
     ```
 
-2. Edit the `.env` file, set up the environment variables as follows, and replace the corresponding placeholders `<>` with your own TiDB connection information:
+2. Edit the `.env` file, set up the environment variables as follows, and replace the corresponding placeholders `{}` with your own TiDB connection information:
 
     ```dotenv
-    DATABASE_HOST=<host>
+    DATABASE_HOST={host}
     DATABASE_PORT=4000
-    DATABASE_USER=<user>
-    DATABASE_PASSWORD=<password>
+    DATABASE_USER={user}
+    DATABASE_PASSWORD={password}
     DATABASE_NAME=test
     ```
 
diff --git a/develop/dev-guide-sample-application-ruby-rails.md b/develop/dev-guide-sample-application-ruby-rails.md
index 8bc76439a1830..83732dbaa02e2 100644
--- a/develop/dev-guide-sample-application-ruby-rails.md
+++ b/develop/dev-guide-sample-application-ruby-rails.md
@@ -97,7 +97,7 @@ Connect to your TiDB cluster depending on the TiDB deployment option you've sele
 6. Edit the `.env` file, set up the `DATABASE_URL` environment variable as follows, and copy the connection string from the connection dialog as the variable value.
 
     ```dotenv
-    DATABASE_URL=mysql2://<user>:<password>@<host>:<port>/<database_name>?ssl_mode=verify_identity
+    DATABASE_URL=mysql2://{user}:{password}@{host}:{port}/{database_name}?ssl_mode=verify_identity
     ```
 
    > **Note**
@@ -126,7 +126,7 @@ Connect to your TiDB cluster depending on the TiDB deployment option you've sele
 5. Edit the `.env` file, set up the `DATABASE_URL` environment variable as follows, copy the connection string from the connection dialog as the variable value, and set the `sslca` query parameter to the file path of the CA certificate downloaded from the connection dialog:
 
     ```dotenv
-    DATABASE_URL=mysql2://<user>:<password>@<host>:<port>/<database>?ssl_mode=verify_identity&sslca=/path/to/ca.pem
+    DATABASE_URL=mysql2://{user}:{password}@{host}:{port}/{database}?ssl_mode=verify_identity&sslca=/path/to/ca.pem
     ```
 
    > **Note**
@@ -146,10 +146,10 @@ Connect to your TiDB cluster depending on the TiDB deployment option you've sele
     cp .env.example .env
     ```
 
-2. Edit the `.env` file, set up the `DATABASE_URL` environment variable as follows, and replace the `<user>`, `<password>`, `<host>`, `<port>`, and `<database>` with your own TiDB connection information:
+2. Edit the `.env` file, set up the `DATABASE_URL` environment variable as follows, and replace the `{user}`, `{password}`, `{host}`, `{port}`, and `{database}` with your own TiDB connection information:
 
     ```dotenv
-    DATABASE_URL=mysql2://<user>:<password>@<host>:<port>/<database>
+    DATABASE_URL=mysql2://{user}:{password}@{host}:{port}/{database}
     ```
 
    If you are running TiDB locally, the default host address is `127.0.0.1`, and the password is empty.