diff --git a/libc/inc/array.h b/libc/inc/array.h
index 5ab8fb4..c235398 100644
--- a/libc/inc/array.h
+++ b/libc/inc/array.h
@@ -6,13 +6,18 @@
 #pragma once
 
 #ifdef __KERNEL__
+/// Function for allocating memory for the array.
 #define ARRAY_ALLOC kmalloc
+/// Function for freeing the memory for the array.
 #define ARRAY_FREE  kfree
 #else
+/// Function for allocating memory for the array.
 #define ARRAY_ALLOC malloc
+/// Function for freeing the memory for the array.
 #define ARRAY_FREE  free
 #endif
 
+/// @brief Declares a new dynamic-size array structure.
 #define DECLARE_ARRAY(type, name)                                                     \
     typedef struct arr_##name##_t {                                                   \
         const unsigned size;                                                          \
diff --git a/libc/inc/bits/termios-struct.h b/libc/inc/bits/termios-struct.h
index 5c698f4..aad92c6 100644
--- a/libc/inc/bits/termios-struct.h
+++ b/libc/inc/bits/termios-struct.h
@@ -42,4 +42,5 @@ typedef struct termios {
 #define ECHOKE  0x00000001 ///< If ICANON is set, KILL is echoed by erasing each character on the line.
 #define IEXTEN  0x00000400 ///< Enables implementation-defined input processing.
 
+/// @brief Mask for extracting control values.
 #define CTRL(x) (x & 037)
\ No newline at end of file
diff --git a/libc/inc/ring_buffer.h b/libc/inc/ring_buffer.h
index d53b66c..dac2827 100644
--- a/libc/inc/ring_buffer.h
+++ b/libc/inc/ring_buffer.h
@@ -5,6 +5,7 @@
 
 #pragma once
 
+/// @brief Declares a fixed-size ring-buffer.
 #define DECLARE_FIXED_SIZE_RING_BUFFER(type, name, length, init)                     \
     typedef struct fs_rb_##name##_t {                                                \
         unsigned size, read, write;                                                  \
@@ -69,13 +70,18 @@
     }
 
 #ifdef __KERNEL__
+/// Function for allocating memory for the ring buffer.
 #define RING_BUFFER_ALLOC kmalloc
+/// Function for freeing the memory for the ring buffer.
 #define RING_BUFFER_FREE  kfree
 #else
+/// Function for allocating memory for the ring buffer.
 #define RING_BUFFER_ALLOC malloc
+/// Function for freeing the memory for the ring buffer.
 #define RING_BUFFER_FREE  free
 #endif
 
+/// @brief Declares a dynamic-size ring-buffer.
 #define DECLARE_RING_BUFFER(type, name, init)                                                       \
     typedef struct rb_##name##_t {                                                                  \
         const unsigned size;                                                                        \
diff --git a/libc/src/unistd/exec.c b/libc/src/unistd/exec.c
index 06a50c2..ac08c32 100644
--- a/libc/src/unistd/exec.c
+++ b/libc/src/unistd/exec.c
@@ -62,6 +62,11 @@ static inline int __find_in_path(const char *file, char *buf, size_t buf_len)
 /// @brief Replaces the current process image with a new process
 ///        image (argument vector), allows the caller to specify
 ///        the environment of the executed program via `envp`.
+/// @param path The absolute path to the binary file to execute.
+/// @param argv A vector of one or more pointers to null-terminated strings that represent
+///             the argument list available to the executed program.
+/// @param envp A vector of one or more pointers to null-terminated strings that represent
+///             the environment list available to the executed program.
 /// @return Returns -1 only if an error has occurred, and sets errno.
 _syscall3(int, execve, const char *, path, char *const *, argv, char *const *, envp)
 
diff --git a/mentos/inc/drivers/keyboard/keymap.h b/mentos/inc/drivers/keyboard/keymap.h
index 683841e..881465e 100644
--- a/mentos/inc/drivers/keyboard/keymap.h
+++ b/mentos/inc/drivers/keyboard/keymap.h
@@ -40,8 +40,10 @@ keymap_type_t get_keymap_type();
 /// @param type The type to set.
 void set_keymap_type(keymap_type_t type);
 
-/// @brief Returns the current keymap.
-/// @return Pointer to the current keymap.
+
+/// @brief Returns the current keymap for the given scancode.
+/// @param scancode the scancode we want.
+/// @return Pointer to the keymap.
 const keymap_t *get_keymap(int scancode);
 
 /// @brief Initializes the supported keymaps.
diff --git a/mentos/inc/drivers/ps2.h b/mentos/inc/drivers/ps2.h
index fdf1c51..20652c6 100644
--- a/mentos/inc/drivers/ps2.h
+++ b/mentos/inc/drivers/ps2.h
@@ -9,6 +9,10 @@
 /// @return 0 on success, 1 on failure.
 int ps2_initialize();
 
+/// @brief Writes data to the PS/2 port.
+/// @param data the data to write.
 void ps2_write(unsigned char data);
 
+/// @brief Reads data from the PS/2 port.
+/// @return the data coming from the PS/2 port.
 unsigned char ps2_read();
\ No newline at end of file
diff --git a/mentos/src/drivers/ps2.c b/mentos/src/drivers/ps2.c
index 6e649ab..224c5ce 100644
--- a/mentos/src/drivers/ps2.c
+++ b/mentos/src/drivers/ps2.c
@@ -17,9 +17,9 @@
 #include "io/debug.h"
 #include "stdbool.h"
 
-#define PS2_DATA    0x60
-#define PS2_STATUS  0x64
-#define PS2_COMMAND 0x64
+#define PS2_DATA    0x60 ///< Data signal line.
+#define PS2_STATUS  0x64 ///< Status signal line.
+#define PS2_COMMAND 0x64 ///< Command signal line.
 
 #define PS2_CTRL_TEST_CONTROLLER 0xAA ///< Test PS/2 Controller. 0x55 passed, 0xFC failed.
 #define PS2_CTRL_P1_ENABLE       0xAE ///< Enable first PS/2 port. No response.
@@ -29,12 +29,12 @@
 #define PS2_CTRL_P2_DISABLE      0xA7 ///< Disable second PS/2 port. No response.
 #define PS2_CTRL_P2_TEST         0xA9 ///< Test second PS/2 port (only if 2 PS/2 ports supported).
 
-#define PS2_TEST_SUCCESS 0xAA
-#define PS2_ECHO_RES     0xEE
-#define PS2_ACK          0xFA
-#define PS2_TEST_FAIL1   0xFC
-#define PS2_TEST_FAIL2   0xFD
-#define PS2_RESEND       0xFE
+#define PS2_TEST_SUCCESS 0xAA ///< Self test passed (sent after "0xFF (reset)" command or keyboard power up).
+#define PS2_ECHO_RES     0xEE ///< Response to "0xEE (echo)" command.
+#define PS2_ACK          0xFA ///< Command acknowledged (ACK).
+#define PS2_TEST_FAIL1   0xFC ///< Self test failed (sent after "0xFF (reset)" command or keyboard power up).
+#define PS2_TEST_FAIL2   0xFD ///< Self test failed (sent after "0xFF (reset)" command or keyboard power up).
+#define PS2_RESEND       0xFE ///< Resend (keyboard wants controller to repeat last command it sent).
 
 // PS/2 Controller Configuration Byte
 // Bit | Meaning
diff --git a/mentos/src/fs/ext2.c b/mentos/src/fs/ext2.c
index e3b09e0..9a6c702 100644
--- a/mentos/src/fs/ext2.c
+++ b/mentos/src/fs/ext2.c
@@ -10,7 +10,7 @@
 /// Change the header.
 #define __DEBUG_HEADER__ "[EXT2  ]"
 /// Set the log level.
-#define __DEBUG_LEVEL__ LOGLEVEL_NOTICE
+#define __DEBUG_LEVEL__ LOGLEVEL_DEBUG
 
 #include "process/scheduler.h"
 #include "process/process.h"
diff --git a/mentos/src/io/proc_video.c b/mentos/src/io/proc_video.c
index d319399..481ff33 100644
--- a/mentos/src/io/proc_video.c
+++ b/mentos/src/io/proc_video.c
@@ -24,6 +24,8 @@
 #include "ctype.h"
 #include "process/scheduler.h"
 
+/// @brief Prints the ring-buffer.
+/// @param rb the ring-buffer to print.
 void print_rb(fs_rb_scancode_t *rb)
 {
     if (!fs_rb_scancode_empty(rb)) {