diff --git a/docs/healthcare-email-stream-plan.md b/docs/healthcare-email-stream-plan.md
index 812c304..23099ea 100644
--- a/docs/healthcare-email-stream-plan.md
+++ b/docs/healthcare-email-stream-plan.md
@@ -293,3 +293,17 @@ Committed and validated on dev:
 
 
 ```
+
+## Campaign tracking (opens/clicks) — fixed 2026-06-06
+listmonk-hc was installed with the default `app.root_url=http://localhost:9000`,
+so every tracking pixel + click-link in sent emails pointed at localhost ->
+recipients couldn't reach them -> **views/clicks always showed 0**. Fixed:
+- `app.root_url` -> `https://lists-hc.performancewest.net` (the public portal vhost)
+- `privacy.individual_tracking` -> `true` (per-subscriber opens/clicks)
+- `privacy.disable_tracking` -> `false`
+- restarted listmonk-hc to load the new root_url.
+Verified: hitting the tracking pixel publicly records a `campaign_views` row, and
+the campaign preview renders pixel+links as `lists-hc.performancewest.net/...`
+with zero `localhost` references. NOTE: emails sent BEFORE this fix (the first
+~100 warmup) had localhost tracking baked in and won't track retroactively; all
+future sends track correctly.