diff --git a/README.md b/README.md
index 11f4193..66d4aad 100644
--- a/README.md
+++ b/README.md
@@ -121,6 +121,9 @@ the GitHub account you want to authenticate with:
 $ slack external-auth add
 ```
 
+**Note: when working with repositories that are part of an organization, be sure
+to grant access to that organization when authorizing your OAuth app.**
+
 After you've added your authentication, you'll need to assign it to the
 `#/workflows/create_new_issue_workflow` workflow using the following command: