diff --git a/src/kernel/thread_manager.rs b/src/kernel/thread_manager.rs
index 0786fa1..56db16b 100644
--- a/src/kernel/thread_manager.rs
+++ b/src/kernel/thread_manager.rs
@@ -144,6 +144,7 @@ impl ThreadManager {
         machine.interrupt.set_status(old_status);
     }
 
+	/// Save the CPU state of a user program on a context switch.
     pub fn thread_save_processor_state(&mut self, machine: &mut Machine, thread: Rc<RefCell<Thread>>) {
         let mut t = thread.borrow_mut();
         for i in 0..NUM_INT_REGS {
@@ -154,6 +155,7 @@ impl ThreadManager {
         }
     }
 
+    /// Restore the CPU state of a user program on a context switch.
     pub fn thread_restore_processor_state(&self, machine: &mut Machine, thread: Rc<RefCell<Thread>>) {
         let t: Ref<_> = thread.borrow();
         for i in 0..NUM_INT_REGS {