diff --git a/app/client/ui/GristTooltips.ts b/app/client/ui/GristTooltips.ts
index 9b7b2554..e212987d 100644
--- a/app/client/ui/GristTooltips.ts
+++ b/app/client/ui/GristTooltips.ts
@@ -147,6 +147,9 @@ see or edit which parts of your document.')
     dom('div', {style: 'margin-top: 8px;'}, t('Example: {{example}}', {
       example: dom.create(buildHighlightedCode, 'choice.Role == "Manager"', {}, {style: 'margin-top: 8px;'}),
     })),
+    dom('div',
+      cssLink({href: commonUrls.helpFilteringReferenceChoices, target: '_blank'}, t('Learn more.')),
+    ),
     ...args,
   ),
 };
diff --git a/app/common/gristUrls.ts b/app/common/gristUrls.ts
index 69f2fa2a..903c3206 100644
--- a/app/common/gristUrls.ts
+++ b/app/common/gristUrls.ts
@@ -86,6 +86,7 @@ export const commonUrls = {
   helpTelemetryLimited: "https://support.getgrist.com/telemetry-limited",
   helpCalendarWidget: "https://support.getgrist.com/widget-calendar",
   helpLinkKeys: "https://support.getgrist.com/examples/2021-04-link-keys",
+  helpFilteringReferenceChoices: "https://support.getgrist.com/col-refs/#filtering-reference-choices-in-dropdown",
   freeCoachingCall: getFreeCoachingCallUrl(),
   contactSupport: getContactSupportUrl(),
   plans: "https://www.getgrist.com/pricing",