diff --git a/src/main/java/de/hitec/nhplus/treatment/Treatment.java b/src/main/java/de/hitec/nhplus/treatment/Treatment.java
index a32864f..e2646b2 100644
--- a/src/main/java/de/hitec/nhplus/treatment/Treatment.java
+++ b/src/main/java/de/hitec/nhplus/treatment/Treatment.java
@@ -19,6 +19,8 @@ import java.util.StringJoiner;
  *
  * @author Bernd Heidemann
  * @author Dominik Säume
+ * @author Armin Ribic
+ * @author Dorian Nemec
  */
 public class Treatment {
     private SimpleIntegerProperty id;
@@ -30,6 +32,7 @@ public class Treatment {
     private final SimpleStringProperty description;
     private final SimpleStringProperty remarks;
     private final SimpleBooleanProperty locked;
+    private int sperrfrist;
 
     /**
      * This constructor allows instantiating a {@link Treatment} object,
@@ -55,6 +58,8 @@ public class Treatment {
         this.description = new SimpleStringProperty(description);
         this.remarks = new SimpleStringProperty(remarks);
         this.locked = new SimpleBooleanProperty(false);
+
+        sperrfrist = 10;
     }
 
     /**
@@ -188,7 +193,10 @@ public class Treatment {
                 .toString();
     }
 
+    /**
+     * Calculates delete date of treatment.
+     */
     public LocalDate calculateDeleteDate() {
-        return DateConverter.convertStringToLocalDate(getDate()).plusYears(10);
+        return DateConverter.convertStringToLocalDate(getDate()).plusYears(sperrfrist);
     }
 }
diff --git a/src/main/java/de/hitec/nhplus/treatment/database/TreatmentDao.java b/src/main/java/de/hitec/nhplus/treatment/database/TreatmentDao.java
index 20c63f0..a02a485 100644
--- a/src/main/java/de/hitec/nhplus/treatment/database/TreatmentDao.java
+++ b/src/main/java/de/hitec/nhplus/treatment/database/TreatmentDao.java
@@ -21,6 +21,8 @@ import java.util.List;
  *
  * @author Bernd Heidemannn
  * @author Dominik Säume
+ * @author Armin Ribic
+ * @author Dorian Nemec
  */
 public class TreatmentDao extends DaoImp<Treatment> {
 
@@ -147,10 +149,11 @@ public class TreatmentDao extends DaoImp<Treatment> {
         return statement;
     }
 
+    /**
+     * Returns all locked treatments.
+     */
     public List<Treatment> readAllLocked() throws SQLException {
         final String SQL = "SELECT * FROM treatment WHERE isLocked = true";
         return getListFromResultSet(this.connection.prepareStatement(SQL).executeQuery());
     }
-
-
 }