diff --git a/src/main/java/de/hitec/nhplus/patient/AllPatientController.java b/src/main/java/de/hitec/nhplus/patient/AllPatientController.java
index 1e99995..16a363e 100644
--- a/src/main/java/de/hitec/nhplus/patient/AllPatientController.java
+++ b/src/main/java/de/hitec/nhplus/patient/AllPatientController.java
@@ -19,6 +19,13 @@ import java.time.LocalDate;
 
 import static de.hitec.nhplus.utils.Validator.*;
 
+/**
+ * The controller for viewing all {@link Patient}s.
+ *
+ * @author Bernd Heideman
+ * @author Dominik Säume
+ * @author Armin Ribic
+ */
 public class AllPatientController {
 
     @FXML
@@ -53,6 +60,10 @@ public class AllPatientController {
     private final ObservableList<Patient> patients = FXCollections.observableArrayList();
     private PatientDao dao;
 
+    /**
+     * Initialization method that is called after the binding of all the fields.
+     */
+    @FXML
     public void initialize() {
         this.readAllAndShowInTableView();
 
@@ -104,6 +115,41 @@ public class AllPatientController {
         this.textFieldRoomNumber.textProperty().addListener(inputNewPatientValidationListener);
     }
 
+    /**
+     * Internal method to read all data and set it to the table view.
+     */
+    private void readAllAndShowInTableView() {
+        this.patients.clear();
+        this.dao = DaoFactory.getInstance().createPatientDAO();
+        try {
+            this.patients.setAll(this.dao.readAll());
+        } catch (SQLException exception) {
+            exception.printStackTrace();
+        }
+    }
+
+    /**
+     * Internal method that stores the changes in the database.
+     */
+    private void doUpdate(TableColumn.CellEditEvent<Patient, String> event) {
+        try {
+            this.dao.update(event.getRowValue());
+        } catch (SQLException exception) {
+            exception.printStackTrace();
+        }
+    }
+
+    /**
+     * Internal method that clears the text fields used for creating a new {@link Patient}.
+     */
+    private void clearTextfields() {
+        this.textFieldFirstName.clear();
+        this.textFieldSurName.clear();
+        this.textFieldDateOfBirth.clear();
+        this.textFieldCareLevel.clear();
+        this.textFieldRoomNumber.clear();
+    }
+
     @FXML
     public void handleOnEditFirstname(TableColumn.CellEditEvent<Patient, String> event) {
         String newFirstName = event.getNewValue();
@@ -164,25 +210,6 @@ public class AllPatientController {
         this.doUpdate(event);
     }
 
-
-    private void doUpdate(TableColumn.CellEditEvent<Patient, String> event) {
-        try {
-            this.dao.update(event.getRowValue());
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-    }
-
-    private void readAllAndShowInTableView() {
-        this.patients.clear();
-        this.dao = DaoFactory.getInstance().createPatientDAO();
-        try {
-            this.patients.addAll(this.dao.readAll());
-        } catch (SQLException exception) {
-            exception.printStackTrace();
-        }
-    }
-
     @FXML
     public void handleDelete() {
         Patient selectedItem = this.tableView.getSelectionModel().getSelectedItem();
@@ -212,12 +239,4 @@ public class AllPatientController {
         readAllAndShowInTableView();
         clearTextfields();
     }
-
-    private void clearTextfields() {
-        this.textFieldFirstName.clear();
-        this.textFieldSurName.clear();
-        this.textFieldDateOfBirth.clear();
-        this.textFieldCareLevel.clear();
-        this.textFieldRoomNumber.clear();
-    }
 }
diff --git a/src/main/java/de/hitec/nhplus/patient/Patient.java b/src/main/java/de/hitec/nhplus/patient/Patient.java
index c7c72ee..6c91229 100644
--- a/src/main/java/de/hitec/nhplus/patient/Patient.java
+++ b/src/main/java/de/hitec/nhplus/patient/Patient.java
@@ -11,6 +11,13 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.StringJoiner;
 
+/**
+ * The model for a {@link Patient}.
+ *
+ * @author Bernd Heideman
+ * @author Dominik Säume
+ * @author Armin Ribic
+ */
 public class Patient extends Person {
     private SimpleIntegerProperty id;
     private final SimpleStringProperty dateOfBirth;
@@ -18,6 +25,13 @@ public class Patient extends Person {
     private final SimpleStringProperty roomNumber;
     private final List<Treatment> allTreatments = new ArrayList<>();
 
+    /**
+     * This constructor allows instantiating a {@link Patient} object,
+     * before it is stored in the database, by omitting the {@link Patient#id ID} value.
+     *
+     * @implSpec Instances created with this constructor can be directly passed to
+     * {@link de.hitec.nhplus.patient.database.PatientDao#create PatientDao.create}.
+     */
     public Patient(
             String firstName,
             String surName,
@@ -31,6 +45,9 @@ public class Patient extends Person {
         this.roomNumber = new SimpleStringProperty(roomNumber);
     }
 
+    /**
+     * This constructor allows instantiating a {@link Patient} object with all existing fields.
+     */
     public Patient(
             int id,
             String firstName,
diff --git a/src/main/java/de/hitec/nhplus/patient/database/PatientDao.java b/src/main/java/de/hitec/nhplus/patient/database/PatientDao.java
index 90ba560..1880005 100644
--- a/src/main/java/de/hitec/nhplus/patient/database/PatientDao.java
+++ b/src/main/java/de/hitec/nhplus/patient/database/PatientDao.java
@@ -11,6 +11,12 @@ import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * The {@link PatientDao} is an implementation of the {@link de.hitec.nhplus.datastorage.Dao Dao} for the {@link Patient} model.
+ *
+ * @author Bernd Heidemann
+ * @author Dominik Säume
+ */
 public class PatientDao extends DaoImp<Patient> {
 
     public PatientDao(Connection connection) {