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-rw-r--r--baremetal/115write-byte.subx5
1 files changed, 5 insertions, 0 deletions
diff --git a/baremetal/115write-byte.subx b/baremetal/115write-byte.subx
index af32f610..3ac587f0 100644
--- a/baremetal/115write-byte.subx
+++ b/baremetal/115write-byte.subx
@@ -1,3 +1,8 @@
+# Write a single byte to a stream.
+#
+# We need to do this in machine code because streams need to be opaque types,
+# and we don't yet support opaque types in Mu.
+
 == code
 #   instruction                     effective address                                                   register    displacement    immediate
 # . op          subop               mod             rm32          base        index         scale       r32