diff --git a/walkers.js b/walkers.js
index f9605c2..c3e6798 100644
--- a/walkers.js
+++ b/walkers.js
@@ -83,20 +83,21 @@ function update_walkers() {
   }
 }
 
-function add_random_direction(pos) {
+// give this function a walker and it will update the walkerition by one tile
+function add_random_direction(walker) {
   let rand = Math.floor(Math.random() * 4);
   if (rand === 0) {
-    pos.row++;
-    pos.row = pos.row.mod(n_rows);
+    walker.row++;
+    walker.row = walker.row.mod(n_rows);
   } else if (rand === 1) {
-    pos.row--;
-    pos.row = pos.row.mod(n_rows);
+    walker.row--;
+    walker.row = walker.row.mod(n_rows);
   } else if (rand === 2) {
-    pos.col++;
-    pos.col = pos.col.mod(n_cols);
+    walker.col++;
+    walker.col = walker.col.mod(n_cols);
   } else {
-    pos.col--;
-    pos.col = pos.col.mod(n_cols);
+    walker.col--;
+    walker.col = walker.col.mod(n_cols);
   }
 }