diff --git a/src/ES32A08.cpp b/src/ES32A08.cpp
index 71a2547..c520924 100644
--- a/src/ES32A08.cpp
+++ b/src/ES32A08.cpp
@@ -381,19 +381,46 @@ int ES32A08::rawReadAnalogVoltage(int channel) {
   return analogRead(voltageInputPins[channel]);
 }
 
-// Set single relay
+
+/**
+ * @brief Sets the state of a specified relay.
+ * 
+ * This function sets the state (on or off) of the relay specified by the 
+ * relay parameter. It updates the currentRelays variable and sends the 
+ * updated state to the shift register.
+ * 
+ * @param relay The relay number to set (0-based index).
+ * @param state The desired state of the relay (true for on, false for off).
+ */
 void ES32A08::setRelay(int relay, bool state) {
   bitWrite(currentRelays, relay, state);
   sendToShiftRegister();
 }
 
 // Set all relays (0b00000000 - 0b11111111)
+/**
+ * @brief Sets the state of the relays.
+ * 
+ * This function updates the current state of the relays and sends the new state
+ * to the shift register.
+ * 
+ * @param relayStates An unsigned long representing the desired state of the relays.
+ */
 void ES32A08::setRelays(unsigned long relayStates) {
   currentRelays = relayStates;
   sendToShiftRegister();
 }
 
 // Read all digital inputs
+/**
+ * @brief Reads the digital inputs from a shift register.
+ * 
+ * This function reads 8 digital inputs from a shift register connected to the
+ * microcontroller. It first loads the inputs by toggling the LOAD165_PIN, then
+ * reads each bit by toggling the CLK165_PIN and reading the DATA165_PIN.
+ * 
+ * @return uint8_t A byte representing the state of the 8 digital inputs.
+ */
 uint8_t ES32A08::readDigitalInputs() {
   uint8_t inputs = 0;
   digitalWrite(LOAD165_PIN, LOW);
@@ -413,6 +440,16 @@ uint8_t ES32A08::readDigitalInputs() {
 }
 
 // Read single digital input
+/**
+ * @brief Reads the state of a specified digital input.
+ *
+ * This function checks the state of a digital input specified by the input number.
+ * The input number must be between 1 and 8, inclusive. If the input number is out
+ * of this range, the function returns false.
+ *
+ * @param inputNumber The number of the digital input to read (1-8).
+ * @return true if the specified digital input is high, false if it is low or if the input number is out of range.
+ */
 bool ES32A08::readDigitalInput(int inputNumber) {
   if (inputNumber < 1 || inputNumber > 8)
     return false;
@@ -421,9 +458,27 @@ bool ES32A08::readDigitalInput(int inputNumber) {
 }
 
 // Set "PWR" onboard LED
+/**
+ * @brief Sets the state of the power LED.
+ * 
+ * This function controls the power LED by setting its state to the specified value.
+ * 
+ * @param state The desired state of the power LED. 
+ *              - `true` to turn the LED off.
+ *              - `false` to turn the LED on.
+ */
 void ES32A08::setPWRLED(bool state) { digitalWrite(PWR_LED_PIN, !state); }
 
 // Read single button state
+/**
+ * @brief Reads the state of a specified button.
+ *
+ * This function reads the digital state of a button specified by its number.
+ * It returns `true` if the button is pressed and `false` otherwise.
+ *
+ * @param buttonNumber The number of the button to read (1-based index).
+ * @return `true` if the button is pressed, `false` otherwise.
+ */
 bool ES32A08::readButton(int buttonNumber) {
   return !digitalRead(buttonPins[buttonNumber - 1]);
 }
\ No newline at end of file