diff --git a/CHANGELOG.md b/CHANGELOG.md
index b353850..7d96121 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,42 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- **Secret Management Frontend - Phase 3: File Attachments UI Integration (Display)** (#200, Part of #191) - **MERGED 22.11.2025**
+  - `AttachmentUpload.tsx` component with drag-and-drop and file validation
+  - `AttachmentPreview.tsx` modal for images and PDFs with zoom controls
+  - Integration of `AttachmentList` component in `SecretDetail.tsx`
+  - Download, delete, and preview handlers with master key management
+  - File size limits (10MB) and type validation (images, PDFs, documents)
+  - Security: Blocks executable files, validates MIME types
+  - 21 new unit tests (547 total tests passing)
+  - Coverage: 87.95% (exceeds 80% requirement)
+  - Part of Secret Management Epic #191 (Phase 3/5)
+
+- **Secret Management Frontend - Phase 2: Secret Create/Edit Forms** (#198, Part of #191) - **MERGED 22.11.2025**
+  - `SecretForm.tsx` reusable form component with validation
+  - `SecretCreate.tsx` page for creating new secrets
+  - `SecretEdit.tsx` page for editing existing secrets
+  - API service extensions: `createSecret()`, `updateSecret()`
+  - Client-side validation and error handling
+  - Password show/hide toggle for security
+  - 28 new unit tests (all passing)
+  - Routing: `/secrets/new` and `/secrets/:id/edit`
+  - Part of Secret Management Epic #191 (Phase 2/5)
+
+- **Secret Management Frontend - Phase 1: Secret List & Detail Views** (#197, Part of #191) - **MERGED 22.11.2025**
+  - `SecretList.tsx` component with search, filtering, and pagination (20 items/page)
+  - `SecretDetail.tsx` full detail view with encrypted fields
+  - `SecretCard.tsx` reusable card component with badges
+  - API service: `secretApi.ts` with `getSecrets()`, `getSecretById()`
+  - Grid/List view toggle (persisted in localStorage)
+  - Filter by tags and expiration status
+  - Password show/hide toggle
+  - Tags, expiration badges, attachment count, shared indicator
+  - 31 new unit tests (450 total tests passing)
+  - Coverage: 87.95% (exceeds 80% requirement)
+  - Routing: `/secrets` and `/secrets/:id`
+  - Part of Secret Management Epic #191 (Phase 1/5)
+
 - **Client-Side File Encryption - Phase 5: Security Audit & Documentation** (#174, Part of #143)
   - Comprehensive security documentation in `CRYPTO_ARCHITECTURE.md`
   - Security audit completed for all encryption code
diff --git a/README.md b/README.md
index 1818203..97ca205 100644
--- a/README.md
+++ b/README.md
@@ -105,7 +105,50 @@ For comprehensive security details, threat model, and cryptographic guarantees,
 - ✅ Phase 2: ShareTarget Integration (PR #178, merged 19.11.2025)
 - ✅ Phase 3: Upload Integration (PR #187, merged 21.11.2025)
 - ✅ Phase 4: Download & Decryption (PR #188, merged 21.11.2025)
-- 🔄 Phase 5: Security Audit & Documentation (PR #190, this PR)
+- ✅ Phase 5: Security Audit & Documentation (PR #190, merged 22.11.2025)
+
+## 🔐 Secret Management (Password Vault UI)
+
+SecPal provides a comprehensive **password vault UI** with encrypted storage, file attachments, and sharing capabilities.
+
+**Features (Phases 1-3 Complete):**
+
+- 📋 **Secret List & Detail Views**: Browse, search, and filter secrets with grid/list toggle
+  - Search by title, filter by tags/expiration status
+  - Pagination (20 items/page)
+  - Password show/hide toggle
+  - Expiration badges, attachment count, shared indicator
+- ✏️ **Create/Edit Forms**: Full CRUD operations with validation
+  - Title, username, password, URL, notes fields
+  - Client-side validation
+  - Loading states and error handling
+- 📎 **File Attachments**: Upload, download, preview encrypted files
+  - Drag-and-drop upload with file validation (10MB max)
+  - Image preview with zoom controls (50%-200%)
+  - PDF preview in modal
+  - File type validation (images, PDFs, documents)
+  - Download with automatic decryption
+
+**Usage Example:**
+
+```tsx
+import { SecretList } from "@/pages/Secrets/SecretList";
+import { SecretDetail } from "@/pages/Secrets/SecretDetail";
+
+// List all secrets
+<SecretList />
+
+// View secret details
+<SecretDetail secretId="uuid" />
+```
+
+**Implementation Status:**
+
+- ✅ Phase 1: Secret List & Detail Views (PR #197, merged 22.11.2025)
+- ✅ Phase 2: Secret Create/Edit Forms (PR #198, merged 22.11.2025)
+- ✅ Phase 3: File Attachments UI Integration (PR #200, merged 22.11.2025)
+- 🔜 Phase 4: Secret Sharing UI (Issue #195)
+- 🔜 Phase 5: Offline Support & PWA Integration (Issue #196)
 
 ## 🌍 Internationalization (i18n)
 
diff --git a/src/components/SecretForm.enhanced.test.tsx b/src/components/SecretForm.enhanced.test.tsx
index 4b4b9d6..3c89abd 100644
--- a/src/components/SecretForm.enhanced.test.tsx
+++ b/src/components/SecretForm.enhanced.test.tsx
@@ -24,7 +24,9 @@ describe("SecretForm", () => {
     it("should generate password when generate button clicked", async () => {
       render(<SecretForm {...defaultProps} />);
 
-      const passwordInput = screen.getByLabelText("Password", { selector: "input" });
+      const passwordInput = screen.getByLabelText("Password", {
+        selector: "input",
+      });
       const generateButton = screen.getByLabelText(/generate password/i);
 
       expect(passwordInput).toHaveValue("");
@@ -39,7 +41,9 @@ describe("SecretForm", () => {
     it("should show password strength indicator when password is entered", async () => {
       render(<SecretForm {...defaultProps} />);
 
-      const passwordInput = screen.getByLabelText("Password", { selector: "input" });
+      const passwordInput = screen.getByLabelText("Password", {
+        selector: "input",
+      });
 
       // Type weak password
       await userEvent.type(passwordInput, "abc");
@@ -52,7 +56,9 @@ describe("SecretForm", () => {
     it("should update strength indicator as password improves", async () => {
       render(<SecretForm {...defaultProps} />);
 
-      const passwordInput = screen.getByLabelText("Password", { selector: "input" });
+      const passwordInput = screen.getByLabelText("Password", {
+        selector: "input",
+      });
 
       // Type weak password
       await userEvent.type(passwordInput, "abc");
@@ -71,9 +77,9 @@ describe("SecretForm", () => {
     it("should toggle password visibility", async () => {
       render(<SecretForm {...defaultProps} />);
 
-      const passwordInput = screen.getByLabelText(
-        "Password", { selector: "input" }
-      ) as HTMLInputElement;
+      const passwordInput = screen.getByLabelText("Password", {
+        selector: "input",
+      }) as HTMLInputElement;
       const toggleButton = screen.getByLabelText(/show password/i);
 
       expect(passwordInput.type).toBe("password");
@@ -233,7 +239,9 @@ describe("SecretForm", () => {
       render(<SecretForm {...defaultProps} />);
 
       const titleInput = screen.getByLabelText(/title/i);
-      const passwordInput = screen.getByLabelText("Password", { selector: "input" });
+      const passwordInput = screen.getByLabelText("Password", {
+        selector: "input",
+      });
       const tagInput = screen.getByPlaceholderText(/enter tag name/i);
       const dateInput = screen.getByLabelText(/expiration date/i);
       const submitButton = screen.getByRole("button", { name: /save/i });