diff --git a/src/buffer.h b/src/buffer.h
index a71f777..bf31787 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -23,18 +23,18 @@ class Buffer {
 	}
 
 	/*
-	Shift buffer left and return index of the first empty element after the shift
-	
-	After elements are sent to display, first BRAILLE_CELLS elements are cleared,
-	but some non-empty elements may remain in the buffer
-
-	e.g.: let brailleCells = 4 and Buffer::size = 7
-	-----------------------------  0   1   2   3   4   5   6  
-	initial state: ------------- | A | B | C | D | E | F | . |
-	after showBuffer(): -------- | . | . | . | . | E | F | . | ( ABCD on display )
-	after shiftBufferLeft(): --- | E | F |[.]| . | . | . | . |
-
-	[.] is the first empty element, its index is returned -> 2
+		Shift buffer left and return index of the first empty element after the shift
+		
+		After elements are sent to display, first BRAILLE_CELLS elements are cleared,
+		but some non-empty elements may remain in the buffer
+
+		e.g.: let brailleCells = 4 and Buffer::size = 7
+		-----------------------------  0   1   2   3   4   5   6  
+		initial state: ------------- | A | B | C | D | E | F | . |
+		after showBuffer(): -------- | . | . | . | . | E | F | . | ( ABCD on display )
+		after shiftBufferLeft(): --- | E | F |[.]| . | . | . | . |
+
+		[.] is the first empty element, its index is returned -> 2
 	*/
 	byte shiftLeft() {
 		byte to = 0;
@@ -54,7 +54,7 @@ class Buffer {
 			_contents[i] = EMPTY;
 	}
 
-	void add(byte element); // defined in translation.h
+	void add(byte element);  // defined in translation.h
 	void add(byte element, byte& index) {
 		_contents[index++] = element;
 	}
diff --git a/src/custom_config.h b/src/custom_config.h
index 4bedc44..6126657 100644
--- a/src/custom_config.h
+++ b/src/custom_config.h
@@ -5,24 +5,24 @@
     If you use PlatformIO, consider configuring it in `platformio.ini` first
 */
 
-// #define AUTO_PIN
-// #define BUTTON_PIN
-// #define DATA_PIN
-// #define LATCH_PIN
-// #define CLOCK_PIN
+// #define AUTO_PIN    // uint
+// #define BUTTON_PIN  // uint
+// #define DATA_PIN    // uint
+// #define LATCH_PIN   // uint
+// #define CLOCK_PIN   // uint
 
-// #define BAUD_RATE
+// #define BAUD_RATE   // uint
 
-// #define BUTTON_CLICK_MS
-// #define BUTTON_CYCLE_MS
+// #define BUTTON_CLICK_MS  // uint
+// #define BUTTON_CYCLE_MS  // uint
 
-// #define AUTOCOUNT_CELLS
-// #define BRAILLE_CELLS
+// #define AUTOCOUNT_CELLS  // bool
+// #define BRAILLE_CELLS    // uint
 
-// #define ANIMATION_ON_START
-// #define ANIMATION_MS_PER_CELL
+// #define ANIMATION_ON_START     // bool
+// #define ANIMATION_MS_PER_CELL  // uint
 
-// #define SERIAL_ECHO
+// #define SERIAL_ECHO  // bool
 
-// #define LF_IS_EOM
-// #define SERIAL_NA_IS_EOM
+// #define LF_IS_EOM         // bool
+// #define SERIAL_NA_IS_EOM  // bool
diff --git a/src/utils.h b/src/utils.h
index 47d8779..f7cd708 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -4,7 +4,7 @@
 #include "patterns.h"
 
 
-void _shiftOut(byte pattern) {
+void _shiftOut(byte pattern=0) {
 	digitalWrite(LATCH_PIN, LOW);
 	shiftOut(DATA_PIN, CLOCK_PIN, MSBFIRST, pattern);
 	digitalWrite(LATCH_PIN, HIGH);
@@ -16,7 +16,7 @@ void countBrailleCells() {
 
 		for (brailleCells = 0; digitalRead(AUTO_PIN); brailleCells++) {
 			delay((ANIMATION_ON_START) ? ANIMATION_MS_PER_CELL : MIN_DELAY_MS);
-			_shiftOut(0);
+			_shiftOut();
 		}
 	#else
 		brailleCells = BRAILLE_CELLS;
@@ -24,7 +24,7 @@ void countBrailleCells() {
 		#if ANIMATION_ON_START
 			for (byte i = 0; i < brailleCells; i++) {
 				delay(ANIMATION_MS_PER_CELL);
-				_shiftOut(0);
+				_shiftOut();
 			}
 		#endif
 	#endif