diff --git a/docs/Dev-Prod Environment Separation-ralph.md b/docs/Dev-Prod Environment Separation-ralph.md
index e5c7766a..f87c1a60 100644
--- a/docs/Dev-Prod Environment Separation-ralph.md	
+++ b/docs/Dev-Prod Environment Separation-ralph.md	
@@ -40,7 +40,7 @@ You are running in an autonomous, unattended loop. On every single execution, yo
 ### Phase 1: Environment Tagging (Sentry + PostHog)
 
 - [x] 1.1 — Add `NEXT_PUBLIC_SENTRY_ENVIRONMENT` to env schema + all Sentry init files
-- [ ] 1.2 — Add PostHog environment super property
+- [x] 1.2 — Add PostHog environment super property
 - [ ] 1-CP — **Checkpoint**: full suite green
 - [ ] 1-PUSH — **Push**: `/push` to PR
 
diff --git a/src/lib/posthog/client.ts b/src/lib/posthog/client.ts
index 3949d6ab..9d1ca187 100644
--- a/src/lib/posthog/client.ts
+++ b/src/lib/posthog/client.ts
@@ -15,6 +15,9 @@ export function getPostHogClient() {
       person_profiles: "identified_only",
       capture_pageview: false, // We capture manually in the provider
     });
+    posthog.register({
+      environment: process.env.NODE_ENV === "production" ? "production" : "development",
+    });
   }
 
   return posthog;