             if subs == 0
                 # no payment sources yet; no subscriptions either: a new user (probably)
                 <span>
-                    If you are teaching a course, choose one of the course packages.
-                    If you need to upgrade your projects, choosing a recurring subscription.
+                    If you are {' '}
+                    <a
+                      href={"https://doc.cocalc.com/teaching-instructors.html"}
+                      target={"_blank"}
+                      rel={"noopener"}
+                    >teaching a course</a>, choose one of the course packages.
+                    If you need to upgrade your personal projects, choose a recurring subscription.
                     You will <b>not be charged</b> until you explicitly click
                     "Add Subscription or Course Package".
                     {help}

        else if subs == 0
            # have a payment source, but no subscriptions
            <span>
                Click "Add Subscription or Course Package...".   If you are teaching a course, choose one of the course packages.
                    If you need to upgrade your projects, choosing a recurring subscription.
                You will be charged only after you select a specific subscription and click
                "Add Subscription or Course Package".
                {help}

            <span>
                You may sign up for the same subscription package more than
                once to increase the number of upgrades that you can use.
                Past invoices and receipts are available below.
                {help}
            </span>

