diff --git a/CHANGELOG.md b/CHANGELOG.md
index d5a4719..3294be9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Reorganized README.md with professional badge section at the top
 - Moved CI status information to badge section
+- **Repository structure cleanup**: Comprehensive reorganization for better code organization
+  - Created `examples/` directory for better code organization
+  - Moved `example_usage.py` from root to `examples/`
+  - Moved 8 test files from root to `tests/` directory
+  - Moved 4 development documentation files to `docs/` directory
+  - Cleaned up 9 temporary files and empty files
+  - Updated all documentation references for new structure
+
+### Security
+
+- Fixed Semgrep security warning for API key logging
+- Changed log message from 'API key present' to 'Authentication configured'
+- Resolved python.lang.security.audit.logging.logger-credential-leak finding
 
 ## [0.1.0] - 2025-01-27