diff --git a/CHANGELOG.md b/CHANGELOG.md
index a64b357..2639fa7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.8.0] - 2025-01-25
+
+### Added
+- Project memory system using CLAUDE.md, CHANGELOG.md, and README.md
+- Versioning rules and documentation update guidelines in CLAUDE.md
+
 ## [0.7.0] - 2025-01-25
 
 ### Added
diff --git a/CLAUDE.md b/CLAUDE.md
index 078501f..97050a0 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1,5 +1,23 @@
 # CLAUDE.md
 
+## Project Memory
+
+This project uses three documentation files as persistent memory. **You must keep these files up to date when making changes:**
+
+| File | Purpose | Update When |
+|------|---------|-------------|
+| `CLAUDE.md` | Technical context for Claude Code sessions | Adding new patterns, conventions, or implementation details |
+| `CHANGELOG.md` | Version history following Keep a Changelog format | Every commit (add entry, bump version) |
+| `README.md` | User-facing documentation | Changing user-visible behavior, adding features, or modifying usage |
+
+### Versioning Rules
+
+- Use semantic versioning (MAJOR.MINOR.PATCH)
+- Increment PATCH for bug fixes and minor updates
+- Increment MINOR for new features and enhancements
+- Increment MAJOR for breaking changes
+- Tag every commit with its version: `git tag -a vX.Y.Z -m "Description"`
+
 ## Project Overview
 
 This repository contains a dual-mode setup script for creating OrbStack-based development sandboxes tailored for Claude Code with Elixir/Erlang, browser automation, and PostgreSQL.
@@ -12,6 +30,7 @@ config.env.example  - Example credentials file
 config.env          - User credentials (gitignored, created on first run)
 .gitignore          - Ignores config.env
 README.md           - User-facing documentation
+CHANGELOG.md        - Version history (Keep a Changelog format)
 CLAUDE.md           - This file (context for Claude Code sessions)
 ```