diff --git a/hive-ag3nt/src/forge_notify.rs b/hive-ag3nt/src/forge_notify.rs
index e3bf3cb4..86e0753b 100644
--- a/hive-ag3nt/src/forge_notify.rs
+++ b/hive-ag3nt/src/forge_notify.rs
@@ -32,7 +32,7 @@ const TOKEN_RETRY_MAX: u32 = 20;
 /// a `new <kind>` label. Later activity that lands on the state-change
 /// path because it carries no `latest_comment_url` (e.g. a bodiless
 /// review submission) fires well outside this window, so we must not
-/// claim it's "new" — see #1637.
+/// claim it's "new" — see docs/forge.md, "new vs activity on".
 const NEW_ITEM_TOLERANCE_SECS: i64 = 120;
 
 /// Spawn point: called once from `hive serve`. Returns immediately if the forge is not
@@ -588,7 +588,8 @@ fn format_state_change_notification(
     // time. A review submitted with no body carries no
     // `latest_comment_url`, so it lands here instead of on the comment
     // path — and its event time is well after `created_at`. Labeling
-    // that "new PR" is misleading (#1637): agents dismiss it as a
+    // that "new PR" is misleading (see docs/forge.md, "new vs activity
+    // on"): agents dismiss it as a
     // duplicate of the original open notification. When we can't confirm
     // creation, fall back to a neutral "activity on" label.
     let looks_new = notification_is_creation(notif, subject.as_ref());
@@ -647,7 +648,8 @@ fn format_state_change_notification(
 /// `created_at`: within `NEW_ITEM_TOLERANCE_SECS` ⇒ creation. When
 /// either timestamp is missing or unparseable we default to `true`,
 /// preserving the prior "new" behavior rather than masking a genuine
-/// new item behind the neutral fallback. See #1637.
+/// new item behind the neutral fallback. See docs/forge.md, "new vs
+/// activity on".
 fn notification_is_creation(
     notif: &serde_json::Value,
     subject: Option<&serde_json::Value>,
@@ -1083,7 +1085,7 @@ mod tests {
         let subject = serde_json::json!({ "created_at": "2026-06-13T11:18:40+02:00" });
         assert!(notification_is_creation(&fresh, Some(&subject)));
 
-        // Review hours later on the same PR → not a creation (#1637).
+        // Review hours later on the same PR → not a creation.
         let later = serde_json::json!({ "updated_at": "2026-06-13T14:55:00+02:00" });
         assert!(!notification_is_creation(&later, Some(&subject)));