diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2d9a4a2..dc1417a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,16 @@
 ## [Unreleased]
 
 ### Added
+- Custom religion system planned for M3: 12 custom tenets, 2 custom doctrine groups (Allomantic Stance, Caste Doctrine), expanded and faith-differentiated holy sites with conditional activation
+- Steel Inquisitor holy order and individual Inquisitor request mechanic planned for M3
+- Keeper Network secret society with progression, coppermind sharing, and Ministry discovery risk planned for M3
+- Full council retheme (5 positions, 10 custom tasks) and 7 court positions (Royal Court) planned for M4
+- Caste law system (Strict/Relaxed/Abolished) with cross-caste consequence events planned for M4
+- Cultural innovation system (Age of the Lord Ruler + Age of Liberation) planned for M4
+- Band council with 7 crew roles, vacancy penalties, and role-specific events planned for M5
+- Advanced council interaction events (kandra replacement, Smoker vs Seeker, Obligator betrayal, Keeper reveal) planned for M7
+- Post-endgame choice: seize the Lord Ruler's throne or release the kingdoms planned for M7
+- Legend system suppression added to M4 vanilla suppression pass
 - Detailed milestone implementation documents (M1-M8) with tasks, acceptance criteria, and testing checkpoints
 - Milestone document template for consistent structure
 - Metal supply and scarcity system planned for M2
@@ -25,6 +35,8 @@
 - Stray province errors from map cleaner due to invalid province IDs
 
 ### Changed
+- Expanded MASTERPLAN scope: added council, religion, caste, innovation, and holy order systems
+- Standardized post-endgame flag to `lord_ruler_fallen` across all milestone docs
 - Expanded MASTERPLAN scope: added metal supply, artifacts, lifestyles, and activities across milestones
 - Added Royal Court DLC as a dependency
 - Bumped supported CK3 version from 1.12 to 1.18 (Crane)