diff --git a/src/guides/http-basic-authentication.md b/src/guides/http-basic-authentication.md
index 93b66e4ff..9cd9568df 100644
--- a/src/guides/http-basic-authentication.md
+++ b/src/guides/http-basic-authentication.md
@@ -40,7 +40,7 @@ Now that we know what basic authentication is, the question is, how does it work
 ### Step 1
 When the browser first requests the server, the server tries to check the availability of the `Authorization` header in the request. Because it is the first request, no `Authorization` header is found in the request. So the server responds with the `401 Unauthorized` response code and also sends the `WWW-Authenticate` header with the value set to `Basic`, which tells the browser that it needs to trigger the basic authentication flow.
 
-```text
+```plaintext
 401 Unauthorized
 WWW-Authenticate: Basic realm='user_pages'
 ```