diff --git a/website/content/docs/authentication-backends.md b/website/content/docs/authentication-backends.md
index 61db2390..81263421 100644
--- a/website/content/docs/authentication-backends.md
+++ b/website/content/docs/authentication-backends.md
@@ -97,7 +97,7 @@ To enable it:
       repo: owner-name/repo-name # Path to your GitLab repository
     ```
 
-### Client-Side Implicit Grant
+### Client-Side Implicit Grant (GitLab)
 
 With GitLab's Implicit Grant, users can authenticate with GitLab directly from the client. To do this:
 
@@ -142,7 +142,7 @@ To enable it:
       repo: owner-name/repo-name # Path to your Bitbucket repository
     ```
 
-### Client-Side Implicit Grant
+### Client-Side Implicit Grant (Bitbucket)
 
 With Bitbucket's Implicit Grant, users can authenticate with Bitbucket directly from the client. To do this:
 
@@ -156,6 +156,8 @@ With Bitbucket's Implicit Grant, users can authenticate with Bitbucket directly
       auth_type: implicit
       app_id: # The Key from your Bitbucket settings
 
+**Warning:** With Bitbucket implicit grant, the authentication is valid for 1 hour only. After that, the user has to login again, **which can lead to data loss** if the expiration occurs while content is being edited.
+
 ## Test Repo Backend
 You can use the `test-repo` backend to try out Netlify CMS without connecting to a Git repo. With this backend, you can write and publish content normally, but any changes will disapear when you reload the page. This backend powers the Netlify CMS [demo site](https://cms-demo.netlify.com/).