diff --git a/app/V1Module/presenters/ReferenceExerciseSolutionsPresenter.php b/app/V1Module/presenters/ReferenceExerciseSolutionsPresenter.php
index 0f3ccd6a..4fc1c94e 100644
--- a/app/V1Module/presenters/ReferenceExerciseSolutionsPresenter.php
+++ b/app/V1Module/presenters/ReferenceExerciseSolutionsPresenter.php
@@ -209,6 +209,33 @@ public function actionDetail(string $solutionId)
         $this->sendSuccessResponse($this->referenceSolutionViewFactory->getReferenceSolution($solution));
     }
 
+    public function checkUpdate(string $solutionId)
+    {
+        $solution = $this->referenceSolutions->findOrThrow($solutionId);
+        if (!$this->referenceSolutionAcl->canUpdate($solution)) {
+            throw new ForbiddenRequestException("You cannot update the ref. solution");
+        }
+    }
+
+    /**
+     * Update details about the ref. solution (note, etc...)
+     * @POST
+     * @Param(type="post", name="note", validation="string:0..65535",
+     *        description="A description by the author of the solution")
+     * @param string $solutionId Identifier of the solution
+     * @throws NotFoundException
+     * @throws InternalServerException
+     */
+    public function actionUpdate(string $solutionId)
+    {
+        $req = $this->getRequest();
+        $solution = $this->referenceSolutions->findOrThrow($solutionId);
+        $solution->setDescription($req->getPost("note"));
+
+        $this->referenceSolutions->flush();
+        $this->sendSuccessResponse($this->referenceSolutionViewFactory->getReferenceSolution($solution));
+    }
+
     public function checkDeleteReferenceSolution(string $solutionId)
     {
         $solution = $this->referenceSolutions->findOrThrow($solutionId);
diff --git a/app/V1Module/router/RouterFactory.php b/app/V1Module/router/RouterFactory.php
index ad169ea2..836e8254 100644
--- a/app/V1Module/router/RouterFactory.php
+++ b/app/V1Module/router/RouterFactory.php
@@ -336,6 +336,7 @@ private static function createReferenceSolutionsRoutes(string $prefix): RouteLis
         );
 
         $router[] = new GetRoute("$prefix/<solutionId>", "ReferenceExerciseSolutions:detail");
+        $router[] = new PostRoute("$prefix/<solutionId>", "ReferenceExerciseSolutions:update");
         $router[] = new DeleteRoute("$prefix/<solutionId>", "ReferenceExerciseSolutions:deleteReferenceSolution");
         $router[] = new PostRoute("$prefix/<id>/resubmit", "ReferenceExerciseSolutions:resubmit");
         $router[] = new GetRoute("$prefix/<solutionId>/submissions", "ReferenceExerciseSolutions:submissions");
diff --git a/app/V1Module/security/ACL/IReferenceExerciseSolutionPermissions.php b/app/V1Module/security/ACL/IReferenceExerciseSolutionPermissions.php
index 14c3da5c..85db10ce 100644
--- a/app/V1Module/security/ACL/IReferenceExerciseSolutionPermissions.php
+++ b/app/V1Module/security/ACL/IReferenceExerciseSolutionPermissions.php
@@ -8,6 +8,8 @@ interface IReferenceExerciseSolutionPermissions
 {
     public function canViewDetail(ReferenceExerciseSolution $referenceExerciseSolution): bool;
 
+    public function canUpdate(ReferenceExerciseSolution $referenceExerciseSolution): bool;
+
     public function canDelete(ReferenceExerciseSolution $referenceExerciseSolution): bool;
 
     public function canEvaluate(ReferenceExerciseSolution $referenceExerciseSolution): bool;
diff --git a/app/config/permissions.neon b/app/config/permissions.neon
index a5380a58..ff836165 100644
--- a/app/config/permissions.neon
+++ b/app/config/permissions.neon
@@ -882,6 +882,7 @@ permissions:
       resource: referenceExerciseSolution
       actions:
           - viewDetail
+          - update
           - promote
 
     - allow: true
@@ -918,6 +919,20 @@ permissions:
                       - referenceExerciseSolution.isExerciseSuperGroupAdmin
                       - referenceExerciseSolution.isExerciseSubGroupNonStudentMember
 
+    - allow: true
+      role: supervisor-student
+      resource: referenceExerciseSolution
+      actions:
+          - update
+      conditions:
+          - or:
+              - referenceExerciseSolution.isAuthor
+              - and:
+                  - referenceExerciseSolution.isPublic
+                  - or:
+                      - referenceExerciseSolution.isExerciseAuthorOrAdmin
+                      - referenceExerciseSolution.isExerciseSuperGroupAdmin
+
     - allow: true
       role: supervisor-student
       resource: referenceExerciseSolution
diff --git a/app/model/entity/ReferenceExerciseSolution.php b/app/model/entity/ReferenceExerciseSolution.php
index 63057739..5f9c306c 100644
--- a/app/model/entity/ReferenceExerciseSolution.php
+++ b/app/model/entity/ReferenceExerciseSolution.php
@@ -101,6 +101,11 @@ public function getDescription(): string
         return $this->description;
     }
 
+    public function setDescription(string $desccription): void
+    {
+        $this->description = $desccription;
+    }
+
     public function getSolution(): Solution
     {
         return $this->solution;
diff --git a/tests/Presenters/ReferenceExerciseSolutionsPresenter.phpt b/tests/Presenters/ReferenceExerciseSolutionsPresenter.phpt
index 4c40f055..f2db5b24 100644
--- a/tests/Presenters/ReferenceExerciseSolutionsPresenter.phpt
+++ b/tests/Presenters/ReferenceExerciseSolutionsPresenter.phpt
@@ -714,6 +714,54 @@ class TestReferenceExerciseSolutionsPresenter extends Tester\TestCase
         Assert::equal(ReferenceExerciseSolution::VISIBILITY_PROMOTED, $payload['visibility']);
         Assert::equal(ReferenceExerciseSolution::VISIBILITY_PROMOTED, $solution->getVisibility());
     }
+
+    public function testUpdateDesription()
+    {
+        PresenterTestHelper::login($this->container, PresenterTestHelper::ANOTHER_SUPERVISOR_LOGIN);
+        $solution = current(array_filter($this->referenceSolutions->findAll(), function ($rs) {
+            // get solutions of logged-in user
+            return $rs->getSolution()->getAuthor()->getEmail() === PresenterTestHelper::ANOTHER_SUPERVISOR_LOGIN;
+        }));
+        Assert::truthy($solution);
+
+        $newNote = 'new-description';
+
+        $payload = PresenterTestHelper::performPresenterRequest(
+            $this->presenter,
+            'V1:ReferenceExerciseSolutions',
+            'POST',
+            [ 'action' => 'update', 'solutionId' => $solution->getId() ],
+            [ 'note' => $newNote ]
+        );
+
+        Assert::equal($newNote, $payload['description']);
+        $this->referenceSolutions->refresh($solution);
+        Assert::equal($newNote, $solution->getDescription());
+    }
+
+    public function testUpdateDesriptionUnauthorized()
+    {
+        PresenterTestHelper::login($this->container, PresenterTestHelper::ANOTHER_SUPERVISOR_LOGIN);
+        $solution = current(array_filter($this->referenceSolutions->findAll(), function ($rs) {
+            // get solutions the do not belong to the logged-in user
+            return $rs->getSolution()->getAuthor()->getEmail() !== PresenterTestHelper::ANOTHER_SUPERVISOR_LOGIN;
+        }));
+        Assert::truthy($solution);
+
+        // another supervisor is not the author, nor admin of the exercise/group...
+        Assert::exception(
+            function () use ($solution) {
+                $payload = PresenterTestHelper::performPresenterRequest(
+                    $this->presenter,
+                    'V1:ReferenceExerciseSolutions',
+                    'POST',
+                    [ 'action' => 'update', 'solutionId' => $solution->getId() ],
+                    [ 'note' => 'new-description' ]
+                );
+            },
+            ForbiddenRequestException::class
+        );
+    }
 }
 
 $testCase = new TestReferenceExerciseSolutionsPresenter();