1 files changed, 3 insertions, 0 deletions
diff --git a/rtl/src/io.v b/rtl/src/io.v
index f53062b..7d6cd4f 100644
--- a/rtl/src/io.v
+++ b/rtl/src/io.v
@@ -1,3 +1,6 @@
+// io:
+// Input and output register, connected to pins of fpga.
+
 module io (
   input clk,
   input rstn,