diff --git a/Apps/Api/Controllers/AccountsController.cs b/Apps/Api/Controllers/AccountsController.cs
index 4a29fb9..4f5fba0 100644
--- a/Apps/Api/Controllers/AccountsController.cs
+++ b/Apps/Api/Controllers/AccountsController.cs
@@ -26,6 +26,11 @@ namespace Api.Controllers
       _tokenParameters = tokenParameters;
     }
 
+    /// <summary>
+    /// Récupère un jeton d'accès pour un utilisateur particulier.
+    /// </summary>
+    /// <param name="command"></param>
+    /// <returns></returns>
     [HttpPost("login")]
     [AllowAnonymous]
     public async Task<IActionResult> Login(LoginViewModel command)
diff --git a/Apps/Api/Controllers/CommentsController.cs b/Apps/Api/Controllers/CommentsController.cs
new file mode 100644
index 0000000..4db8c37
--- /dev/null
+++ b/Apps/Api/Controllers/CommentsController.cs
@@ -0,0 +1,48 @@
+using System;
+using System.Threading.Tasks;
+using HN.Application;
+using HN.Domain;
+using MediatR;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Api.Controllers
+{
+  [ApiController]
+  [Route("api/[controller]")]
+  public sealed class CommentsController : ControllerBase
+  {
+    private readonly IMediator _bus;
+
+    public CommentsController(IMediator bus)
+    {
+      _bus = bus;
+    }
+
+    /// <summary>
+    /// Upvote un commentaire particulier.
+    /// </summary>
+    /// <param name="id"></param>
+    /// <returns></returns>
+    [HttpPut("{id}/upvote")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    public async Task<IActionResult> Upvote(Guid id)
+    {
+      await _bus.Send(new VoteForCommentCommand(id, VoteType.Up));
+      return NoContent();
+    }
+
+    /// <summary>
+    /// Downvote un commentaire particulier.
+    /// </summary>
+    /// <param name="id"></param>
+    /// <returns></returns>
+    [HttpPut("{id}/downvote")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    public async Task<IActionResult> Downvote(Guid id)
+    {
+      await _bus.Send(new VoteForCommentCommand(id, VoteType.Down));
+      return NoContent();
+    }
+  }
+}
\ No newline at end of file
diff --git a/Apps/Api/Startup.cs b/Apps/Api/Startup.cs
index 06439a3..f6570a8 100644
--- a/Apps/Api/Startup.cs
+++ b/Apps/Api/Startup.cs
@@ -71,7 +71,7 @@ namespace Api
         o.Filters.Add(new AuthorizeFilter()); // Ou MapControllers().RequireAuthentication()
       });
 
-      services.AddSwaggerDocument(d =>
+      services.AddOpenApiDocument(d =>
       {
         // cf. https://github.com/RicoSuter/NSwag/wiki/AspNetCore-Middleware#enable-authentication-in-generator-and-swagger-ui
 
@@ -100,8 +100,6 @@ namespace Api
         {
           od.Info.Title = "Hacker news like API in .Net";
         };
-
-        d.SchemaType = NJsonSchema.SchemaType.OpenApi3;
       });
     }
 
diff --git a/Apps/Api/swagger.json b/Apps/Api/swagger.json
index d16fda3..4a56ec2 100644
--- a/Apps/Api/swagger.json
+++ b/Apps/Api/swagger.json
@@ -11,6 +11,7 @@
         "tags": [
           "Accounts"
         ],
+        "summary": "Récupère un jeton d'accès pour un utilisateur particulier.",
         "operationId": "Accounts_Login",
         "requestBody": {
           "x-name": "command",
@@ -39,6 +40,58 @@
         }
       }
     },
+    "/api/comments/{id}/upvote": {
+      "put": {
+        "tags": [
+          "Comments"
+        ],
+        "summary": "Upvote un commentaire particulier.",
+        "operationId": "Comments_Upvote",
+        "parameters": [
+          {
+            "name": "id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "guid"
+            },
+            "x-position": 1
+          }
+        ],
+        "responses": {
+          "204": {
+            "description": ""
+          }
+        }
+      }
+    },
+    "/api/comments/{id}/downvote": {
+      "put": {
+        "tags": [
+          "Comments"
+        ],
+        "summary": "Downvote un commentaire particulier.",
+        "operationId": "Comments_Downvote",
+        "parameters": [
+          {
+            "name": "id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string",
+              "format": "guid"
+            },
+            "x-position": 1
+          }
+        ],
+        "responses": {
+          "204": {
+            "description": ""
+          }
+        }
+      }
+    },
     "/api/links": {
       "get": {
         "tags": [