diff --git a/js/imgGallery.js b/js/imgGallery.js
index cb13fd7..ecebf05 100644
--- a/js/imgGallery.js
+++ b/js/imgGallery.js
@@ -8,7 +8,7 @@ headerImage = document.getElementById("headerImage");
 touchDragStartX = null;
 touchDragThreshold = 50;
 touchDirection = null;
-touchLock = false;
+directionDetermined = false;
 
 function enlargeImage (filename) {
   viewState = photos.indexOf(filename);
@@ -73,19 +73,20 @@ function mouseUpHandler (event) {
 
 function onTouchMove (event) {
   screenX = event.changedTouches[0].screenX;
-  if (!touchLock && touchDragStartX == null) {
+  if (!directionDetermined && touchDragStartX == null) {
     touchDragStartX = screenX;
   };
   touchDelta = Math.abs(touchDragStartX - screenX);
-  if (!touchLock && (touchDelta > touchDragThreshold)) {
+  if (!directionDetermined && (touchDelta > touchDragThreshold)) {
     touchDirection = touchDragStartX > screenX;
     touchDragStartX = null;
-    touchLock = true;
+    directionDetermined = true;
 };
 };
 
 function onTouchEnd (event) {
-  touchLock = false;
+  // poorly phrased, but this must reset state to default
+  directionDetermined = false;
   touchDragStartX = null;
   if (touchDirection == null) {
     return;