diff --git a/add_mileage_modal.php b/add_mileage_modal.php
index 64bc670c..04f3e686 100644
--- a/add_mileage_modal.php
+++ b/add_mileage_modal.php
@@ -51,6 +51,10 @@
             <label>Purpose</label>
             <textarea rows="4" class="form-control" name="purpose" required></textarea>
           </div>
+          <div class="custom-control custom-checkbox">
+            <input type="checkbox" class="custom-control-input" id="customControlAutosizing" name="roundtrip" value="1" >
+            <label class="custom-control-label" for="customControlAutosizing">Roundtrip</label>
+          </div>
         </div>
         <div class="modal-footer">
           <button type="button" class="btn btn-secondary" data-dismiss="modal">Cancel</button>
diff --git a/post.php b/post.php
index 7812bce4..7135ed3f 100644
--- a/post.php
+++ b/post.php
@@ -229,10 +229,15 @@ if(isset($_POST['add_mileage'])){
     $starting_location = strip_tags(mysqli_real_escape_string($mysqli,$_POST['starting_location']));
     $destination = strip_tags(mysqli_real_escape_string($mysqli,$_POST['destination']));
     $miles = intval($_POST['miles']);
+    $roundtrip = intval($_POST['roundtrip']);
     $purpose = strip_tags(mysqli_real_escape_string($mysqli,$_POST['purpose']));
 
     mysqli_query($mysqli,"INSERT INTO mileage SET mileage_date = '$date', mileage_starting_location = '$starting_location', mileage_destination = '$destination', mileage_miles = $miles, mileage_purpose = '$purpose'");
 
+    if($roundtrip == 1){
+        mysqli_query($mysqli,"INSERT INTO mileage SET mileage_date = '$date', mileage_starting_location = '$destination', mileage_destination = '$starting_location', mileage_miles = $miles, mileage_purpose = '$purpose'");
+    }
+
     $_SESSION['alert_message'] = "Mileage added";
     
     header("Location: mileage.php");