diff --git a/kernel/trampoline.S b/kernel/trampoline.S
index 3f514dd..201cd4a 100644
--- a/kernel/trampoline.S
+++ b/kernel/trampoline.S
@@ -31,13 +31,16 @@ uservec:
 
         # save user a0 in sscratch so
         # a0 can be used to get at TRAPFRAME.
-        csrw sscratch, a0
+        # CSRW = Control and Status Register Write
+        csrw sscratch, a0 # Save the userspace a0 in sscratch
 
         # each process has a separate p->trapframe memory area,
         # but it's mapped to the same virtual address
         # (TRAPFRAME) in every process's user page table.
         li a0, TRAPFRAME
 
+        # INFO: To see the layout of TRAPFRAME, see: proc.h
+
         # save the user registers in TRAPFRAME
         sd ra, 40(a0)
         sd sp, 48(a0)
@@ -48,6 +51,7 @@ uservec:
         sd t2, 88(a0)
         sd s0, 96(a0)
         sd s1, 104(a0)
+        // Note that we dont save a0
         sd a1, 120(a0)
         sd a2, 128(a0)
         sd a3, 136(a0)
@@ -71,8 +75,9 @@ uservec:
         sd t6, 280(a0)
 
 	# save the user a0 in p->trapframe->a0
-        csrr t0, sscratch
-        sd t0, 112(a0)
+        # CSRR = Control and Status Register Read
+        csrr t0, sscratch # Get the userspace a0 from where we stored it before
+        sd t0, 112(a0) # Store userspace a0 in p->trapframe->a0
 
         # initialize kernel stack pointer, from p->trapframe->kernel_sp
         ld sp, 8(a0)
@@ -83,7 +88,6 @@ uservec:
         # load the address of usertrap(), from p->trapframe->kernel_trap
         ld t0, 16(a0)
 
-
         # fetch the kernel page table address, from p->trapframe->kernel_satp.
         ld t1, 0(a0)
 
@@ -94,7 +98,7 @@ uservec:
         # install the kernel page table.
         csrw satp, t1
 
-        # flush now-stale user entries from the TLB.
+        # flush now-stale user entries from the TLB (Translation Lookaside Buffer)
         sfence.vma zero, zero
 
         # jump to usertrap(), which does not return