diff --git a/Kernel/Syscalls/ftruncate.cpp b/Kernel/Syscalls/ftruncate.cpp
index feaf027a992..f02af95b8ab 100644
--- a/Kernel/Syscalls/ftruncate.cpp
+++ b/Kernel/Syscalls/ftruncate.cpp
@@ -9,6 +9,8 @@
 
 namespace Kernel {
 
+// NOTE: The length is passed by pointer because off_t is 64bit,
+// hence it can't be passed by register on 32bit platforms.
 ErrorOr<FlatPtr> Process::sys$ftruncate(int fd, Userspace<off_t const*> userspace_length)
 {
     VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
diff --git a/Kernel/Syscalls/read.cpp b/Kernel/Syscalls/read.cpp
index 2f9e21e98a8..cd70a06e102 100644
--- a/Kernel/Syscalls/read.cpp
+++ b/Kernel/Syscalls/read.cpp
@@ -86,6 +86,8 @@ ErrorOr<FlatPtr> Process::sys$read(int fd, Userspace<u8*> buffer, size_t size)
     return TRY(description->read(user_buffer, size));
 }
 
+// NOTE: The offset is passed by pointer because off_t is 64bit,
+// hence it can't be passed by register on 32bit platforms.
 ErrorOr<FlatPtr> Process::sys$pread(int fd, Userspace<u8*> buffer, size_t size, Userspace<off_t const*> userspace_offset)
 {
     VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)