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diff --git a/openpower/sv/bitmanip.mdwn b/openpower/sv/bitmanip.mdwn
index 5cb5d51f3a65249a2085099f363e5da424eff743..b39ed6696768629a94563c487e5f6315c0a946c6 100644 (file)
--- a/openpower/sv/bitmanip.mdwn
+++ b/openpower/sv/bitmanip.mdwn
@@ -508,10 +508,15 @@ uint64_t gorc64(uint64_t RA, uint64_t RB)
 
 ```
 
-# Galois Field
+# Galois Field 2^M
 
 see <https://courses.csail.mit.edu/6.857/2016/files/ffield.py>
 
+## SPRs to set modulo and degree
+
+to save registers and make operations orthogonal with standard
+arithmetic the modulo is to be set in an SPR
+
 ## Multiply
 
 this requires 3 parameters and a "degree"