diff --git a/TODO.md b/TODO.md
index c1949d8..41fa7b1 100644
--- a/TODO.md
+++ b/TODO.md
@@ -78,6 +78,12 @@
   - Made path configuration loading optional with fallback values
   - Fixed associative array syntax and error handling
   - Status command now works correctly showing system directories and files
+- ✅ **Single-Instance Enforcement**: Fixed duplicate D-Bus handler/daemon instance loop
+  - Systemd and D-Bus single-instance logic now working
+  - Confirmed only one daemon process runs at a time
+  - No more 'already a handler' errors
+  - Integration with apt-layer.sh does not spawn extra daemons
+  - Ready for full D-Bus integration testing
 - 🎯 **D-Bus Method Testing**: Ready to test package management operations
 - 🎯 **apt-layer.sh Integration**: Ready to test shell script integration
 
diff --git a/src/apt-ostree.py/docs/CHANGELOG.md b/src/apt-ostree.py/docs/CHANGELOG.md
index 442db1d..7e3d74e 100644
--- a/src/apt-ostree.py/docs/CHANGELOG.md
+++ b/src/apt-ostree.py/docs/CHANGELOG.md
@@ -109,6 +109,12 @@
   - Daemon now properly handles concurrent async operations without blocking
   - All package management methods (InstallPackages, RemovePackages, etc.) now work correctly
 
+- Fixed duplicate D-Bus handler/daemon instance bug that caused 'already a handler' errors and multiple daemon processes
+- Enforced single-instance logic via systemd and D-Bus name ownership
+- Confirmed only one daemon process runs at a time, even when triggered by apt-layer.sh
+- Integration with apt-layer.sh no longer spawns extra daemons
+- Successfully broke the loop and ready for full D-Bus integration testing
+
 ### Added
 - **Systemd Service Integration**: Complete systemd service setup for apt-ostree daemon
   - Created `apt-ostreed.service` with proper security hardening and OSTree integration