diff --git a/sz_f1.ino b/sz_f1.ino
index a49ef46..9b42c92 100644
--- a/sz_f1.ino
+++ b/sz_f1.ino
@@ -10,6 +10,7 @@ char keymap[numRows][numCols] = {
     {'7', '8', '9', 'C'},
     {'*', '0', '#', 'D'}
 };
+// keypad pins
 byte rowPins[numRows] = {13, 12, 11, 10};
 byte colPins[numCols] = {9, 8, 7, 6};
 Keypad keypad = Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);
@@ -17,12 +18,12 @@ Keypad keypad = Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);
 #include <Servo.h>
 Servo servo;
 
-//leds
+// led pins
 const int greenLed = 1;
 const int ledArray[6] = {2, 3, 4, 5, 6, 7};
 const int redLed = 8;
 
-// constants
+// pins
 const int registerInput = 1;
 const int outputRegister = 2;
 const int shiftRegister = 3;