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-rw-r--r--subx/100index2
1 files changed, 2 insertions, 0 deletions
diff --git a/subx/100index b/subx/100index
index db6f4cdd..355b43d3 100644
--- a/subx/100index
+++ b/subx/100index
@@ -3,6 +3,8 @@
 10-29: level 1, the SubX subset of the 32-bit x86 ISA
 30-39: level 2, moving past counting bytes with operands and labels
 
+See layer 29 for the description of 'level'.
+
 --- Overview of tracing depths
 0: errors
 1-98: app level traces for different SubX programs