1 files changed, 1 insertions, 0 deletions
diff --git a/notes b/notes
index 7db6b73..540f60c 100644
--- a/notes
+++ b/notes
@@ -183,6 +183,7 @@ Small set in between
 * Length in bytes (including header)
   bit 63-60: 0 1 1 0
   bit 59: reserved for GC
+  bit 58: optimized or being optimized
 * Length of opcode block (rounded to 8 byte)
 * [ <opcode> ]*
 * [ <object pointer> ]*