diff --git a/include/kernel/io.h b/include/kernel/io.h
index 718bb20..be82998 100644
--- a/include/kernel/io.h
+++ b/include/kernel/io.h
@@ -3,34 +3,95 @@
 #include "kint.h"
 #include "registers.h"
 
+/**
+ * IO port for keyboard commands.
+ */
 #define KBD_CMD_PORT 0x64
+
+/**
+ * IO port for keyboard data
+ */
 #define KBD_DATA_PORT 0x60
 
-struct kbd_scan_code_info
-{
-	bool pressed;
-	bool escape;
-	char key;
-};
-
-extern struct kbd_scan_code_info scan_code_table[0xff];
-
+/**
+ * Write a byte to a port
+ */
 void outb(ushort port, uchar val);
+
+/**
+ * Write a double word to a port.
+ */
 void outl(ushort port, uint val);
+
+/**
+ * Read a byte from a port.
+ */
 uchar inb(ushort port);
+
+/**
+ * Read a word from a port.
+ */
 ushort inw(ushort port);
+
+/**
+ * Write a word to a port.
+ */
+void outw(ushort port, ushort val);
+
+/**
+ * Just waste some time.
+ */
+void nop();
+
+/**
+ * Read a double word from a port
+ */
 uint inl(ushort port);
 
-/* Random string.h stuff, TODO: move to own header */
+/**
+ * Set n bytes of s to c.
+ */
 void *memset(void *s, int c, size_t n);
+
+/**
+ * Copy n bytes from src to dest.
+ */
 void *memcpy(void *dest, const void *src, size_t n);
+
+/**
+ * Copy null terminated string src to dest.
+ */
 void strcpy(char *dest, char *src);
+
+/**
+ * Compare two strings. This might not work like the libc function, so be
+ * careful.
+ * @returns 0 if equal, non-0 otherwise.
+ */
 int strcmp(char *a, char *b);
+/**
+ * @returns the length of null-terminated string a.
+ */
 uint strlen(char *a);
 
 bool isdigit(char c);
+/**
+ * Ignores trailing non-digit characters.
+ * @returns 0 if string is not a valid decimal integer
+ */
 uint parse_int(char *string);
 
+/**
+ * Read a scan code from the keyboard
+ */
 uchar kbd_scan_code();
+
+/**
+ * Keyboard IRQ handler
+ */
 void kbd_handle_input(struct registers *registers);
+
+/**
+ * Set up keyboard driver.
+ */
 void init_kbd();