diff --git a/GLOSSARY.md b/GLOSSARY.md
index 83aff9c..153c4e7 100644
--- a/GLOSSARY.md
+++ b/GLOSSARY.md
@@ -81,4 +81,20 @@ The per-Mode list of Sessions with date, Plan, duration and Set Logs.
 
 **Streak**:
 A single, subtle, Duolingo-style daily streak shared by both Modes: consecutive days with at least one
-complete Session in either Mode, however short. Incomplete Sessions do not count.
+complete Session in either Mode, however short. Incomplete Sessions do not count. Shown as a small 🔥
+and count in the top bar (grey until today is done); tapping it opens current/longest Streak and a
+month calendar. Protected by Streak Freezes and the Grace Hour.
+
+**Streak Day**:
+The day a complete Session counts for. Normally its calendar day, except during the Grace Hour.
+
+**Grace Hour**:
+00:00–01:00. A Session completed then counts for the previous day if that day has no complete Session
+yet; otherwise it counts for the current day.
+
+**Streak Freeze**:
+A saved token that is used automatically to cover a missed day so the Streak survives.
+
+**Reminder**:
+A local notification sent only if no complete Session exists for the current Streak Day. Two by
+default (19:00 and a late-night one); times and on/off are adjustable in Settings.
diff --git a/docs/adr/0004-player-flow-streak-and-identity.md b/docs/adr/0004-player-flow-streak-and-identity.md
index cd1f4fb..b516971 100644
--- a/docs/adr/0004-player-flow-streak-and-identity.md
+++ b/docs/adr/0004-player-flow-streak-and-identity.md
@@ -11,3 +11,17 @@ Status: Accepted (2026-10-28)
 6. **Theme**: Fixed look per Mode, no light/dark setting for now.
 7. **Fonts**: Nunito (Stretching), Barlow Condensed (Workout).
 8. **App ID**: `de.zendric.zenxercise`.
+
+## Addendum (round 5)
+
+9. **Superset rest**: per-Superset switch "Rest between exercises", off by default.
+10. **Streak UI**: small flame + count in the top bar, "+1 🔥" on the Session summary, tap for a panel with
+    current/longest Streak and a month calendar. No full-screen celebrations or milestones in v1.
+11. **Streak Freezes** are in v1. **Grace Hour** 00:00–01:00 counts for the previous day unless that
+    day is already done.
+12. **Reminders**: two adjustable daily Reminders (19:00 and late night), skipped when the day is done.
+    A Settings screen hosts them.
+13. **Session summary**: duration, Exercises, Set Logs and the Streak line.
+14. **No UI prototype**: the Streak is built directly in the app.
+15. **Build order**: setup/data/designs → Library → Plan editor → Player + summary → History, Streak,
+    Reminders. Commit and push after each stage; check in after stages 1 and 4.
diff --git a/future_ideas.md b/future_ideas.md
index c97366c..c4a63cf 100644
--- a/future_ideas.md
+++ b/future_ideas.md
@@ -13,4 +13,5 @@ Things deliberately left out of v1.
 - Vibration cues and voice guidance in the Player
 - Translations (v1 is English only)
 - Light/dark setting per Mode (v1 has a fixed look per Mode)
+- Full-screen Streak celebrations and milestones (7/30/100/365 days)
 - Mixed Plans that combine Stretching and Workout (e.g. warm-up, workout, cool-down)