diff --git a/kernel/core/gdt.c b/kernel/core/gdt.c
index e645646d..55377b6a 100644
--- a/kernel/core/gdt.c
+++ b/kernel/core/gdt.c
@@ -1,12 +1,15 @@
 #include <system.h>
 
 /*
- * Global Descriptor Tablet Entry
+ * Global Descriptor Table Entry
  */
 struct gdt_entry {
+	/* Limits */
 	unsigned short limit_low;
+	/* Segment address */
 	unsigned short base_low;
 	unsigned char base_middle;
+	/* Access modes */
 	unsigned char access;
 	unsigned char granularity;
 	unsigned char base_high;
diff --git a/kernel/core/idt.c b/kernel/core/idt.c
index 87df2544..f10a60f9 100644
--- a/kernel/core/idt.c
+++ b/kernel/core/idt.c
@@ -11,6 +11,9 @@ struct idt_entry {
 	unsigned short base_high;
 } __attribute__((packed));
 
+/*
+ * IDT pointer
+ */
 struct idt_ptr {
 	unsigned short limit;
 	uintptr_t base;
diff --git a/kernel/core/irq.c b/kernel/core/irq.c
index 0e959f89..e82854cc 100644
--- a/kernel/core/irq.c
+++ b/kernel/core/irq.c
@@ -19,6 +19,9 @@ extern void _irq15();
 
 static irq_handler_t irq_routines[16] = { NULL };
 
+/*
+ * Install an interupt handler for a hardware device.
+ */
 void
 irq_install_handler(
 		int irq,
@@ -27,6 +30,9 @@ irq_install_handler(
 	irq_routines[irq] = handler;
 }
 
+/*
+ * Remove an interrupt handler for a hardware device.
+ */
 void
 irq_uninstall_handler(
 		int irq
@@ -34,6 +40,9 @@ irq_uninstall_handler(
 	irq_routines[irq] = 0;
 }
 
+/*
+ * Remap interrupt handlers
+ */
 void
 irq_remap() {
 	outportb(0x20, 0x11);
@@ -48,6 +57,9 @@ irq_remap() {
 	outportb(0xA1, 0x0);
 }
 
+/*
+ * Set up interrupt handler for hardware devices.
+ */
 void
 irq_install() {
 	irq_remap();