diff --git a/src/Git/Value/SemVerVersion.php b/src/Git/Value/SemVerVersion.php
index c6f3a220..04883395 100644
--- a/src/Git/Value/SemVerVersion.php
+++ b/src/Git/Value/SemVerVersion.php
@@ -79,6 +79,11 @@ public function isNewMinorRelease(): bool
         return $this->patch === 0;
     }
 
+    public function isNewMajorRelease(): bool
+    {
+        return $this->minor === 0 && $this->patch === 0;
+    }
+
     public function lessThanEqual(self $other): bool
     {
         return $this->fullReleaseName() <= $other->fullReleaseName();
diff --git a/src/Github/Api/V3/CreateMilestoneThroughApiCall.php b/src/Github/Api/V3/CreateMilestoneThroughApiCall.php
index 72951d49..190aeaf8 100644
--- a/src/Github/Api/V3/CreateMilestoneThroughApiCall.php
+++ b/src/Github/Api/V3/CreateMilestoneThroughApiCall.php
@@ -63,6 +63,7 @@ public function __invoke(RepositoryName $repository, SemVerVersion $version): vo
             ->getBody()
             ->write(json_encode([
                 'title' => $version->fullReleaseName(),
+                'description' => $this->milestoneDescription($version),
             ]));
 
         $response = $this->client->sendRequest($request);
@@ -93,4 +94,17 @@ public function __invoke(RepositoryName $repository, SemVerVersion $version): vo
             $version->fullReleaseName()
         ));
     }
+
+    private function milestoneDescription(SemVerVersion $version): string
+    {
+        if ($version->isNewMajorRelease()) {
+            return 'Backwards incompatible release (major)';
+        }
+
+        if ($version->isNewMinorRelease()) {
+            return 'Feature release (minor)';
+        }
+
+        return sprintf('%s bugfix release (patch)', $version->targetReleaseBranchName()->name());
+    }
 }
diff --git a/test/unit/Git/Value/SemVerVersionTest.php b/test/unit/Git/Value/SemVerVersionTest.php
index 6d55587c..2630fb76 100644
--- a/test/unit/Git/Value/SemVerVersionTest.php
+++ b/test/unit/Git/Value/SemVerVersionTest.php
@@ -119,6 +119,38 @@ public function newMinorReleasesProvider(): array
         ];
     }
 
+    /**
+     * @dataProvider newMajorReleasesProvider
+     */
+    public function testIsNewMajorRelease(string $milestoneName, bool $expected): void
+    {
+        self::assertSame(
+            $expected,
+            SemVerVersion::fromMilestoneName($milestoneName)
+                         ->isNewMajorRelease()
+        );
+    }
+
+    /**
+     * @return array<int, array<int, string|bool>>
+     *
+     * @psalm-return array<int, array{0: string, 1: bool}>
+     */
+    public function newMajorReleasesProvider(): array
+    {
+        return [
+            ['3.0.1', false],
+            ['3.0.0', true],
+            ['2.0.10', false],
+            ['2.0.0', true],
+            ['1.0.0', true],
+            ['1.1.0', false],
+            ['1.1.1', false],
+            ['1.1.2', false],
+            ['1.1.90', false],
+        ];
+    }
+
     /**
      * @dataProvider lessThanEqualProvider
      */
diff --git a/test/unit/Github/Api/V3/CreateMilestoneTest.php b/test/unit/Github/Api/V3/CreateMilestoneTest.php
index 373e1557..d05e6089 100644
--- a/test/unit/Github/Api/V3/CreateMilestoneTest.php
+++ b/test/unit/Github/Api/V3/CreateMilestoneTest.php
@@ -87,6 +87,7 @@ public function testSuccessfulRequest(): void
                 self::assertJsonStringEqualsJsonString(
                     <<<'JSON'
                     {
+                        "description": "1.2.x bugfix release (patch)",
                         "title": "1.2.3"
                     }
                     JSON,
@@ -146,7 +147,8 @@ public function testExistingMilestone(): void
                 self::assertJsonStringEqualsJsonString(
                     <<<'JSON'
                     {
-                        "title": "1.2.3"
+                        "description": "Feature release (minor)",
+                        "title": "2.1.0"
                     }
                     JSON,
                     $request->getBody()->__toString()
@@ -160,7 +162,59 @@ public function testExistingMilestone(): void
 
         $this->createMilestone->__invoke(
             RepositoryName::fromFullName('foo/bar'),
-            SemVerVersion::fromMilestoneName('1.2.3')
+            SemVerVersion::fromMilestoneName('2.1.0')
+        );
+    }
+
+    public function testMajorMilestone(): void
+    {
+        $this->messageFactory
+            ->expects(self::any())
+            ->method('createRequest')
+            ->with('POST', 'https://api.github.com/repos/foo/bar/milestones')
+            ->willReturn(new Request('https://the-domain.com/the-path'));
+
+        $validResponse = (new Response())->withStatus(201);
+
+        $validResponse->getBody()->write(
+            <<<'JSON'
+            {
+                "html_url": "http://another-domain.com/the-pr"
+            }
+            JSON
+        );
+
+        $this->httpClient
+            ->expects(self::once())
+            ->method('sendRequest')
+            ->with(self::callback(function (RequestInterface $request): bool {
+                self::assertSame(
+                    [
+                        'Host'          => ['the-domain.com'],
+                        'Content-Type'  => ['application/json'],
+                        'User-Agent'    => ['Ocramius\'s minimal API V3 client'],
+                        'Authorization' => ['token ' . $this->apiToken],
+                    ],
+                    $request->getHeaders()
+                );
+
+                self::assertJsonStringEqualsJsonString(
+                    <<<'JSON'
+                    {
+                        "description": "Backwards incompatible release (major)",
+                        "title": "3.0.0"
+                    }
+                    JSON,
+                    $request->getBody()->__toString()
+                );
+
+                return true;
+            }))
+            ->willReturn($validResponse);
+
+        $this->createMilestone->__invoke(
+            RepositoryName::fromFullName('foo/bar'),
+            SemVerVersion::fromMilestoneName('3.0.0')
         );
     }
 }