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diff --git a/openpower/sv/vector_swizzle.mdwn b/openpower/sv/vector_swizzle.mdwn
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 # SV Vector Prefix Swizzle
 
+<https://bugs.libre-soc.org/show_bug.cgi?id=139>
+
 3D GPU operations on batches of vec2, vec3 and vec4 often require re-ordering of the elements in an "out of lane" fashion with respect to standard high performance non-GPU-centric Vector Processors.  Examples include:
 
 * Normalisation of Vectors of XYZ with respect to one dimension