diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -19,9 +19,9 @@ This is useful if you `docker push` your images to Docker Hub. It provides an ea
 
 #### Required environment variables
 
-- `DOCKERHUB_USERNAME` - Docker Hub username
-- `DOCKERHUB_PASSWORD` - Docker Hub password
-- `DOCKERHUB_REPOSITORY` - The Docker Hub repository to update in the format `<namespace>/<name>`
+- `DOCKERHUB_USERNAME` - Docker Hub username. If updating a Docker Hub repository belonging to an organization, this user must have `Admin` permissions for the repository.
+- `DOCKERHUB_PASSWORD` - Docker Hub password.
+- `DOCKERHUB_REPOSITORY` - The Docker Hub repository to update in the format `<namespace>/<name>`.
 
 Note that `DOCKERHUB_REPOSITORY` may also be passed as a secret if considered sensitive.