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diff --git a/openpower/power_trans_ops.mdwn b/openpower/power_trans_ops.mdwn
index 24d5651bb51bd89e78b13ca9eab41e0e9a348659..17445c079fcff82cfda28e73b9e99486a041abbd 100644 (file)
--- a/openpower/power_trans_ops.mdwn
+++ b/openpower/power_trans_ops.mdwn
@@ -1,7 +1,9 @@
 # DRAFT List of 2-arg opcodes
 
-These are X-Form, recommended Major Opcode 63 for full-width
-and 59 for half-width (ending in s)
+These are A-Form, recommended Major Opcode 63 for full-width
+and 59 for half-width (ending in s). Major Opcode 63 has room
+for 9 A-Form 5-bit XO instructions, 00001, 01001, 01010, 01011,
+01101, 10000, 10001, 10011, 11011
 
 | opcode    | Description            | pseudocode                 | Extension   |
 | ------    | ----------------       | ----------------           | ----------- |