diff --git a/docs/usage/routes.md b/docs/usage/routes.md
index 5e738554..78973f82 100644
--- a/docs/usage/routes.md
+++ b/docs/usage/routes.md
@@ -238,6 +238,15 @@ Depending on the situation, several things can happen:
 !!! fail "`400 Bad Request`"
     Invalid token.
 
+!!! fail "`400 Bad Request`"
+    The OAuth provider didn't return an e-mail address. Make sure this provider return e-mail address through their API and you have asked for the required scope.
+
+    ```json
+    {
+        "detail": "OAUTH_NOT_AVAILABLE_EMAIL"
+    }
+    ```
+
 !!! fail "`400 Bad Request`"
     Another user with the same e-mail address already exists.
 
@@ -292,6 +301,15 @@ Handle the OAuth callback and add the OAuth account to the current authenticated
 !!! fail "`400 Bad Request`"
     Invalid token.
 
+!!! fail "`400 Bad Request`"
+    The OAuth provider didn't return an e-mail address. Make sure this provider return e-mail address through their API and you have asked for the required scope.
+
+    ```json
+    {
+        "detail": "OAUTH_NOT_AVAILABLE_EMAIL"
+    }
+    ```
+
 !!! success "`200 OK`"
     ```json
     {