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diff --git a/openpower/sv/branches.mdwn b/openpower/sv/branches.mdwn
index ce659db0cc525755732c566f8eb6a4f1a59bb7d9..00fb4d26fc964dd1b167249c3482eda3d0a2f966 100644 (file)
--- a/openpower/sv/branches.mdwn
+++ b/openpower/sv/branches.mdwn
@@ -272,6 +272,11 @@ In short, Vectorised Branch becomes an extremely powerful tool.
 
 ## CTR-test
 
+Where a standard Scalar v3.0B branch unconditionally decrements
+CTR when `BO[2]` is clear, CTR-test Mode introduces more flexibility
+which allows CTR to be used for many more types of Vector loops
+constructs.
+
 CTR-test mode and CTi interaction is as follows: note that
 `BO[2]` is still required to be clear for CTR decrements to be
 considered, exactly as is the case in Scalar Power ISA v3.0B