diff --git a/src/app/issues/issue-comments/issue-comments.css b/src/app/issues/issue-comments/issue-comments.css
new file mode 100644
index 0000000..fdef573
--- /dev/null
+++ b/src/app/issues/issue-comments/issue-comments.css
@@ -0,0 +1,92 @@
+.section-header {
+  font-size: 0.7rem;
+  font-weight: 700;
+  text-transform: uppercase;
+  letter-spacing: 0.07em;
+  color: #6b7280;
+  background-color: #f9fafb;
+}
+
+.comment-item {
+  padding-bottom: 1rem;
+  border-bottom: 1px solid #f3f4f6;
+}
+
+.comment-item:last-of-type {
+  border-bottom: none;
+  padding-bottom: 0;
+}
+
+.comment-meta {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  flex-wrap: wrap;
+}
+
+.comment-date {
+  font-size: 0.78rem;
+  font-weight: 600;
+  color: #374151;
+}
+
+.comment-edited {
+  font-size: 0.75rem;
+  color: #9ca3af;
+  font-style: italic;
+}
+
+.comment-actions {
+  margin-left: auto;
+  display: flex;
+  gap: 0.5rem;
+}
+
+.comment-action-btn {
+  border: none;
+  background: none;
+  font-size: 0.75rem;
+  color: #6b7280;
+  cursor: pointer;
+  padding: 0;
+}
+
+.comment-action-btn:hover {
+  color: #111827;
+  text-decoration: underline;
+}
+
+.comment-action-delete:hover {
+  color: #b91c1c;
+}
+
+.comment-text {
+  font-size: 0.875rem;
+  line-height: 1.6;
+  color: #374151;
+}
+
+.comment-text :is(h1, h2, h3, h4) {
+  margin-top: 0.5rem;
+  margin-bottom: 0.25rem;
+  font-weight: 700;
+}
+
+.comment-text p {
+  margin-bottom: 0.4rem;
+}
+
+.comment-text p:last-child {
+  margin-bottom: 0;
+}
+
+.comment-text code {
+  background: #f3f4f6;
+  border-radius: 0.25rem;
+  padding: 0.1em 0.35em;
+  font-size: 0.85em;
+}
+
+.comment-new {
+  padding-top: 0.5rem;
+}
diff --git a/src/app/issues/issue-comments/issue-comments.html b/src/app/issues/issue-comments/issue-comments.html
new file mode 100644
index 0000000..0b56166
--- /dev/null
+++ b/src/app/issues/issue-comments/issue-comments.html
@@ -0,0 +1,51 @@
+<!-- suppress HtmlUnknownAttribute -->
+<div class="card shadow-sm mb-3">
+  <div class="card-header section-header">Commentaires</div>
+  <div class="card-body d-flex flex-column gap-3">
+
+    @for (comment of comments(); track comment.id) {
+      <div class="comment-item">
+        <div class="comment-meta">
+          <span class="comment-date">{{ formatDate(comment.createdAt) }}</span>
+          @if (comment.updatedAt) {
+            <span class="comment-edited">(modifié le {{ formatDate(comment.updatedAt) }})</span>
+          }
+          <div class="comment-actions">
+            <button type="button" class="comment-action-btn" (click)="startEditComment(comment)">Modifier</button>
+            <button type="button" class="comment-action-btn comment-action-delete" (click)="deleteComment(comment.id)">Supprimer</button>
+          </div>
+        </div>
+
+        @if (editingCommentId === comment.id) {
+          <textarea
+            aria-label="Modifier le commentaire"
+            class="form-control form-control-sm mt-2"
+            rows="3"
+            [(ngModel)]="editingCommentText"
+            (keydown.escape)="cancelEditComment()"
+          ></textarea>
+          <div class="d-flex gap-2 mt-2">
+            <button type="button" class="btn btn-sm btn-primary" (click)="saveEditComment()" [disabled]="!editingCommentText.trim()">Enregistrer</button>
+            <button type="button" class="btn btn-sm btn-outline-secondary" (click)="cancelEditComment()">Annuler</button>
+          </div>
+        } @else {
+          <div class="comment-text markdown-body mt-1" [innerHTML]="parseMarkdown(comment.text)"></div>
+        }
+      </div>
+    }
+
+    <div class="comment-new">
+      <textarea
+        aria-label="Nouveau commentaire"
+        class="form-control form-control-sm"
+        rows="3"
+        placeholder="Ajouter un commentaire... (Markdown supporté)"
+        [(ngModel)]="newCommentText"
+      ></textarea>
+      <div class="d-flex justify-content-end mt-2">
+        <button type="button" class="btn btn-sm btn-primary" (click)="addComment()" [disabled]="!newCommentText.trim()">Ajouter</button>
+      </div>
+    </div>
+
+  </div>
+</div>
diff --git a/src/app/issues/issue-comments/issue-comments.ts b/src/app/issues/issue-comments/issue-comments.ts
new file mode 100644
index 0000000..a916e52
--- /dev/null
+++ b/src/app/issues/issue-comments/issue-comments.ts
@@ -0,0 +1,81 @@
+import { Component, computed, inject, input } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
+import { marked } from 'marked';
+import { IssueComment, IssuesStore } from '../issues.store';
+
+@Component({
+  selector: 'app-issue-comments',
+  imports: [FormsModule],
+  templateUrl: './issue-comments.html',
+  styleUrl: './issue-comments.css',
+})
+export class IssueComments {
+  private readonly issuesStore = inject(IssuesStore);
+  private readonly sanitizer = inject(DomSanitizer);
+
+  readonly issueId = input.required<number>();
+
+  protected readonly comments = computed(
+    () => this.issuesStore.issues().find((i) => i.id === this.issueId())?.comments ?? [],
+  );
+
+  protected newCommentText = '';
+  protected editingCommentId: number | null = null;
+  protected editingCommentText = '';
+
+  protected parseMarkdown(text: string): SafeHtml {
+    const html = marked.parse(text) as string;
+    return this.sanitizer.bypassSecurityTrustHtml(html);
+  }
+
+  protected formatDate(iso: string): string {
+    return new Date(iso).toLocaleString('fr-FR', {
+      day: '2-digit',
+      month: '2-digit',
+      year: 'numeric',
+      hour: '2-digit',
+      minute: '2-digit',
+    });
+  }
+
+  protected addComment(): void {
+    const text = this.newCommentText.trim();
+    if (!text) return;
+    const issue = this.issuesStore.getById(this.issueId());
+    if (!issue) return;
+    const nextId = Math.max(0, ...issue.comments.map((c) => c.id)) + 1;
+    const comment: IssueComment = { id: nextId, text, createdAt: new Date().toISOString(), updatedAt: null };
+    this.issuesStore.upsert({ ...issue, comments: [...issue.comments, comment] });
+    this.newCommentText = '';
+  }
+
+  protected startEditComment(comment: IssueComment): void {
+    this.editingCommentId = comment.id;
+    this.editingCommentText = comment.text;
+  }
+
+  protected saveEditComment(): void {
+    const text = this.editingCommentText.trim();
+    if (!text || this.editingCommentId === null) return;
+    const issue = this.issuesStore.getById(this.issueId());
+    if (!issue) return;
+    const updatedComments = issue.comments.map((c) =>
+      c.id === this.editingCommentId ? { ...c, text, updatedAt: new Date().toISOString() } : c,
+    );
+    this.issuesStore.upsert({ ...issue, comments: updatedComments });
+    this.editingCommentId = null;
+    this.editingCommentText = '';
+  }
+
+  protected cancelEditComment(): void {
+    this.editingCommentId = null;
+    this.editingCommentText = '';
+  }
+
+  protected deleteComment(id: number): void {
+    const issue = this.issuesStore.getById(this.issueId());
+    if (!issue) return;
+    this.issuesStore.upsert({ ...issue, comments: issue.comments.filter((c) => c.id !== id) });
+  }
+}
diff --git a/src/app/issues/issue-detail/issue-detail.html b/src/app/issues/issue-detail/issue-detail.html
index b10ecc7..674ea4f 100644
--- a/src/app/issues/issue-detail/issue-detail.html
+++ b/src/app/issues/issue-detail/issue-detail.html
@@ -247,6 +247,11 @@
   </div>
 }
 
+<!-- Commentaires -->
+@if (!isNewIssueRoute) {
+  <app-issue-comments [issueId]="issue.id" />
+}
+
 @if (isNewIssueRoute) {
   <div class="d-flex justify-content-end gap-2 mt-4">
     <button type="button" class="btn btn-outline-secondary" (click)="cancelCreation()">Annuler</button>
diff --git a/src/app/issues/issue-detail/issue-detail.ts b/src/app/issues/issue-detail/issue-detail.ts
index 2810d30..0fac2d0 100644
--- a/src/app/issues/issue-detail/issue-detail.ts
+++ b/src/app/issues/issue-detail/issue-detail.ts
@@ -5,10 +5,11 @@ import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
 import { ActivatedRoute, Router } from '@angular/router';
 import { marked } from 'marked';
 import { IssueEntity, IssuesStore } from '../issues.store';
+import { IssueComments } from '../issue-comments/issue-comments';
 
 @Component({
   selector: 'app-issue-detail',
-  imports: [FormsModule],
+  imports: [FormsModule, IssueComments],
   templateUrl: './issue-detail.html',
   styleUrl: './issue-detail.css',
 })
@@ -158,6 +159,7 @@ export class IssueDetail {
       description: '',
       estimatedTime: null,
       dependsOnIds: [],
+      comments: [],
       priority: 'Moyenne',
       status: 'draft',
       progress: 0,
@@ -277,6 +279,7 @@ export class IssueDetail {
         description: '',
         estimatedTime: null,
         dependsOnIds: [],
+        comments: [],
         priority: 'Moyenne',
         status: 'draft',
         progress: 0,
@@ -296,6 +299,7 @@ export class IssueDetail {
         description: '',
         estimatedTime: null,
         dependsOnIds: [],
+        comments: [],
         priority: 'Moyenne',
         status: 'draft',
         progress: 0,
diff --git a/src/app/issues/issues.store.ts b/src/app/issues/issues.store.ts
index 05d4ead..908c3df 100644
--- a/src/app/issues/issues.store.ts
+++ b/src/app/issues/issues.store.ts
@@ -6,6 +6,13 @@ export type IssueStatus = 'draft' | 'todo' | 'done' | 'in-progress';
 export type IssuePriority = 'Basse' | 'Moyenne' | 'Haute';
 export type IssueType = 'Epic' | 'Bug' | 'Study' | 'Story' | 'Task' | 'Technical Story';
 
+export type IssueComment = {
+  id: number;
+  text: string;
+  createdAt: string;
+  updatedAt: string | null;
+};
+
 export type IssueEntity = {
   id: number;
   type: IssueType;
@@ -16,6 +23,7 @@ export type IssueEntity = {
   description: string;
   estimatedTime: number | null;
   dependsOnIds: number[];
+  comments: IssueComment[];
   priority: IssuePriority;
   status: IssueStatus;
   progress: number;
@@ -32,6 +40,7 @@ const DEFAULT_ISSUES: IssueEntity[] = [
     description: 'Corriger le comportement du menu sur petits ecrans.',
     estimatedTime: 8,
     dependsOnIds: [],
+    comments: [],
     priority: 'Haute',
     status: 'in-progress',
     progress: 35,
@@ -46,6 +55,7 @@ const DEFAULT_ISSUES: IssueEntity[] = [
     description: 'Fiabiliser les regles de validation du formulaire projet.',
     estimatedTime: 16,
     dependsOnIds: [],
+    comments: [],
     priority: 'Moyenne',
     status: 'todo',
     progress: 20,
@@ -60,6 +70,7 @@ const DEFAULT_ISSUES: IssueEntity[] = [
     description: 'Mettre a jour le wording d accueil selon la charte produit.',
     estimatedTime: 4,
     dependsOnIds: [],
+    comments: [],
     priority: 'Basse',
     status: 'done',
     progress: 100,
@@ -135,6 +146,7 @@ export class IssuesStore {
       type: issue.type ?? 'Story',
       estimatedTime: issue.estimatedTime ?? null,
       dependsOnIds: normalizedDependencies,
+      comments: Array.isArray(issue.comments) ? issue.comments : [],
     } as IssueEntity;
   }