diff --git a/app/metrics.yaml b/app/metrics.yaml
index 230f67c14..57f9e4dd7 100644
--- a/app/metrics.yaml
+++ b/app/metrics.yaml
@@ -253,7 +253,9 @@ events:
     extra_keys:
       mode:
         description: |
-          The mode the link was opened in. Either 'PRIVATE' or 'NORMAL'.
+          The mode the link was opened in. Either 'PRIVATE' or 'NORMAL'. N.B.:
+          this probe may be incorrectly implemented: see
+          https://github.com/mozilla-mobile/fenix/issues/14133
     bugs:
       - https://github.com/mozilla-mobile/fenix/issues/5737
     data_reviews:
diff --git a/docs/metrics.md b/docs/metrics.md
index 88633ba61..b38e0ac6e 100644
--- a/docs/metrics.md
+++ b/docs/metrics.md
@@ -106,7 +106,7 @@ The following metrics are added to the ping:
 | events.app_received_intent |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The system received an Intent for the HomeActivity. An intent is received an external entity wants to the app to display content. Intents can be received when the app is closed – at which point the app will be opened – or when the app is already opened – at which point the already open app will make changes such as loading a url. This can be used loosely as a heuristic for when the user requested to open the app. The HomeActivity encompasses the home screen and browser screen but may include other screens. This differs from the app_opened probe because it measures all startups, not just cold startup.  |[1](https://github.com/mozilla-mobile/fenix/pull/11940/)|<ul><li>source: The method used to open Fenix. Possible values are `app_icon`, `custom_tab`, `link` or `unknown` </li></ul>|2020-12-01 | |
 | events.browser_menu_action |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A browser menu item was tapped  |[1](https://github.com/mozilla-mobile/fenix/pull/1214#issue-264756708), [2](https://github.com/mozilla-mobile/fenix/pull/5098#issuecomment-529658996), [3](https://github.com/mozilla-mobile/fenix/pull/6310)|<ul><li>item: A string containing the name of the item the user tapped. These items include:    Settings, Help, Desktop Site toggle on/off, Find in Page,   New Tab, Private Tab, Share, Report Site Issue, Back/Forward button,   Reload Button, Quit, Reader Mode On, Reader Mode Off, Open In app,   Add To Top Sites, Add-ons Manager, Bookmarks, History </li></ul>|2020-10-01 |2 |
 | events.entered_url |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user entered a url  |[1](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673)|<ul><li>autocomplete: A boolean that tells us whether the URL was autofilled by an Autocomplete suggestion </li></ul>|2020-10-01 |2 |
-| events.opened_link |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a link with Fenix  |[1](https://github.com/mozilla-mobile/fenix/pull/5975)|<ul><li>mode: The mode the link was opened in. Either 'PRIVATE' or 'NORMAL'. </li></ul>|2020-10-01 |2 |
+| events.opened_link |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a link with Fenix  |[1](https://github.com/mozilla-mobile/fenix/pull/5975)|<ul><li>mode: The mode the link was opened in. Either 'PRIVATE' or 'NORMAL'. N.B.: this probe may be incorrectly implemented: see https://github.com/mozilla-mobile/fenix/issues/14133 </li></ul>|2020-10-01 |2 |
 | events.performed_search |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user performed a search  |[1](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673), [2](https://github.com/mozilla-mobile/fenix/pull/1677)|<ul><li>source: A string that tells us how the user performed the search. Possible values are:  * default.action * default.suggestion * shortcut.action * shortcut.suggestion </li></ul>|2020-10-01 |2 |
 | events.preference_toggled |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user toggled a boolean preference in settings  |[1](https://github.com/mozilla-mobile/fenix/pull/1896), [2](https://github.com/mozilla-mobile/fenix/pull/5704), [3](https://github.com/mozilla-mobile/fenix/pull/5886), [4](https://github.com/mozilla-mobile/fenix/pull/5975), [5](https://github.com/mozilla-mobile/fenix/pull/6352), [6](https://github.com/mozilla-mobile/fenix/pull/6601), [7](https://github.com/mozilla-mobile/fenix/pull/6746)|<ul><li>enabled: Whether or not the preference is *now* enabled</li><li>preference_key: The preference key for the boolean (true/false) preference the user toggled.  We currently track: show_search_suggestions, remote_debugging, telemetry, tracking_protection, search_bookmarks, search_browsing_history, show_clipboard_suggestions, show_search_shortcuts, open_links_in_a_private_tab (bug in implementation https://github.com/mozilla-mobile/fenix/issues/7384), pref_key_sync_logins, pref_key_sync_bookmarks, pref_key_sync_history, pref_key_show_voice_search, and pref_key_show_search_suggestions_in_private. </li></ul>|2020-10-01 |1, 2 |
 | events.search_bar_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped the search bar  |[1](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673)|<ul><li>source: The view the user was on when they initiated the search (For example: `Home` or `Browser`) </li></ul>|2020-10-01 |2 |