diff --git a/fsm/rtl/top.v b/fsm/rtl/top.v
index 3366aa1..0709da2 100644
--- a/fsm/rtl/top.v
+++ b/fsm/rtl/top.v
@@ -26,10 +26,11 @@ module top(i_clk, o_led, lcol1);
    always @(posedge clk_12MHz)
       {strobe, counter} <= counter + 1'b1;
 
-   // shifting bit, to the left
+   // shifting bit
    always @(posedge clk_12MHz)
       if (strobe)
-         obuf <= {obuf[6:0], obuf[7]};
+         obuf <= {obuf[6:0], obuf[7]}; // left shift
+         // obuf <= {obuf[0], obuf[7:1]}; // right shift
 
    always @(*)
       o_led = ~obuf;