diff --git a/api/pmt.yml b/api/pmt.yml
index 476a476..59837b3 100644
--- a/api/pmt.yml
+++ b/api/pmt.yml
@@ -65,9 +65,6 @@ components:
         plannedEnd:
           type: string
           format: date-time
-        end:
-          type: string
-          format: date-time
     CreatedProjectDTO:
       type: object
       properties:
@@ -260,3 +257,27 @@ paths:
                 type: string
         500:
           $ref: "#/components/responses/InternalError"
+  /project/{id}/completed:
+    post:
+      operationId: "completeProject"
+      description: "Complete a specific project"
+      parameters:
+        - in: path
+          name: id
+          schema:
+            type: integer
+            format: int64
+          required: true
+      responses:
+        204:
+          description: "Completed"
+        401:
+          $ref: "#/components/responses/Unauthorized"
+        404:
+          description: "Project not found"
+          content:
+            text/plain:
+              schema:
+                type: string
+        500:
+          $ref: "#/components/responses/InternalError"
diff --git a/src/main/java/de/hmmh/pmt/ApiController.java b/src/main/java/de/hmmh/pmt/ApiController.java
index 577b292..0f90f1f 100644
--- a/src/main/java/de/hmmh/pmt/ApiController.java
+++ b/src/main/java/de/hmmh/pmt/ApiController.java
@@ -19,6 +19,7 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 
+import java.time.LocalDateTime;
 import java.util.Optional;
 
 @Controller
@@ -172,4 +173,17 @@ public class ApiController implements DefaultApi {
 
         return new ResponseEntity<>(HttpStatus.NO_CONTENT);
     }
+
+    @Override
+    public ResponseEntity<Void> completeProject(Long id) {
+        Optional<Project> optionalProject = projectRepository.findById(id);
+        if (optionalProject.isEmpty()) {
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+        Project project = optionalProject.get();
+
+        project.setRealEnd(LocalDateTime.now());
+        projectRepository.save(project);
+        return new ResponseEntity<>(HttpStatus.NO_CONTENT);
+    }
 }
diff --git a/src/main/java/de/hmmh/pmt/util/Mapper.java b/src/main/java/de/hmmh/pmt/util/Mapper.java
index c57ae46..0d1d0e9 100644
--- a/src/main/java/de/hmmh/pmt/util/Mapper.java
+++ b/src/main/java/de/hmmh/pmt/util/Mapper.java
@@ -38,7 +38,6 @@ public class Mapper {
         project.setAdministratorId(dto.getAdministratorId());
         project.setStart(dto.getStart());
         project.setPlannedEnd(dto.getPlannedEnd());
-        project.setRealEnd(dto.getEnd());
         return project;
     }
 }
diff --git a/src/test/java/de/hmmh/pmt/project/EditTest.java b/src/test/java/de/hmmh/pmt/project/EditTest.java
new file mode 100644
index 0000000..8542e9f
--- /dev/null
+++ b/src/test/java/de/hmmh/pmt/project/EditTest.java
@@ -0,0 +1,48 @@
+package de.hmmh.pmt.project;
+
+import de.hmmh.pmt.IntegrationTest;
+import de.hmmh.pmt.db.Project;
+import de.hmmh.pmt.dtos.CreateProjectDTO;
+import de.hmmh.pmt.dtos.UpdateProjectDTO;
+import de.hmmh.pmt.employee.dtos.EmployeeResponseDTO;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.RequestBuilder;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+
+import java.util.Map;
+
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+public class EditTest extends IntegrationTest {
+
+    @Test
+    void successfullyRenamed() throws Exception {
+        when(this.mockEmployeeApi.findById(Mockito.anyLong()))
+                .thenReturn(new EmployeeResponseDTO());
+
+        Map<String, Project> allProjects = createTestProjectData();
+        Project projectToEdit = allProjects.get("medical-research");
+
+        UpdateProjectDTO dto = new UpdateProjectDTO();
+        dto.setName("Mafia Drug Ring");
+        dto.setGoal(projectToEdit.getGoal());
+        dto.setCustomerId(projectToEdit.getCustomerId());
+        dto.setAdministratorId(projectToEdit.getAdministratorId());
+        dto.setStart(projectToEdit.getStart());
+        dto.setPlannedEnd(projectToEdit.getPlannedEnd());
+
+        this.mvc
+                .perform(getRequest(projectToEdit.getId(), dto))
+                .andExpect(status().isNoContent());
+    }
+
+    private RequestBuilder getRequest(long id, UpdateProjectDTO dto) throws Exception {
+        return MockMvcRequestBuilders
+                .put(baseUri + "/project/" + id)
+                .content(this.objectMapper.writeValueAsString(dto))
+                .contentType(MediaType.APPLICATION_JSON);
+    }
+}