add reference to distributed doc for clarity (#9783)

docs/erasure/README.md

@@ -26,7 +26,7 @@ MinIO's erasure coded backend uses high speed [HighwayHash](https://github.com/m
 
 MinIO divides the drives you provide into erasure-coding sets of *4 to 16* drives.  Therefore, the number of drives you present must be a multiple of one of these numbers.  Each object is written to a single erasure-coding set.
 
-Minio uses the largest possible EC set size which divides into the number of drives given.  For example, *18 drives* are configured as *2 sets of 9 drives*, and *24 drives* are configured as *2 sets of 12 drives*.
+Minio uses the largest possible EC set size which divides into the number of drives given. For example, *18 drives* are configured as *2 sets of 9 drives*, and *24 drives* are configured as *2 sets of 12 drives*.  This is true for scenarios when running MinIO as a standalone erasure coded deployment. In [distributed setup however node (affinity) based](https://docs.minio.io/docs/distributed-minio-quickstart-guide.html) erasure stripe sizes are chosen.
 
 The drives should all be of approximately the same size.