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-rw-r--r--subx/055trace.subx4
1 files changed, 2 insertions, 2 deletions
diff --git a/subx/055trace.subx b/subx/055trace.subx
index b9ab5e67..f5e3d7bf 100644
--- a/subx/055trace.subx
+++ b/subx/055trace.subx
@@ -1,9 +1,9 @@
 # helpers for emitting traces to a trace stream, and for tests to check the trace stream
 #
 # A trace stream looks like this:
-#   read : int
+#   read : int  # index that we've read until
 #   write : int  # index at which writes go
-#   data : (array byte)  # prefixed by length
+#   data : (array byte)  # prefixed by length as usual
 # In a real trace the data will be in a special segment set aside for the purpose.
 #
 # primitives for operating on traces: