diff --git a/boot/start.s b/boot/start.S
similarity index 100%
rename from boot/start.s
rename to boot/start.S
diff --git a/kernel/print.c b/kernel/print.c
index 0e2730b..c86ec33 100644
--- a/kernel/print.c
+++ b/kernel/print.c
@@ -58,6 +58,16 @@ void putx(unsigned int i) {
 	}
 }
 
+void putb(unsigned int i) {
+	int j;
+
+	puts("0b");
+
+	for (j = 0; j < 32; j++) {
+		putc((i>>(31-j)) & 1 ? '1' : '0');
+	}
+}
+
 int print(char *fmt, ...) {
 	char *c;
 	va_list arg;
@@ -81,6 +91,9 @@ int print(char *fmt, ...) {
 			case 'x':
 				putx(va_arg(arg, unsigned int));
 				break;
+			case 'b':
+				putb(va_arg(arg, unsigned int));
+				break;
 			default:
 				puts("\nError: print(): Invalid formatting character: '");
 				putc(*c);