diff --git a/src/apr.rs b/src/apr.rs
index 6979720..c04130b 100644
--- a/src/apr.rs
+++ b/src/apr.rs
@@ -50,9 +50,11 @@ impl Apr {
         let board = board::make_board(r, c);
         let mut actors: Vec<actor::Actor> = Vec::new();
         for i in 0..r {
+            // white side
             actors.push(Apr::make_actor(_ctx, "/pawn.png", i, 0, 0));
         }
         for i in 0..r {
+            // black side
             actors.push(Apr::make_actor(_ctx, "/pawn2.png", i, c - 1, 0));
         }
         Ok(Apr {