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diff --git a/README.md b/README.md
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@@ -15,6 +15,8 @@ combined with the [Anglian 3L transverter](http://www.g4ddk.com/Products.html).
   * Offer a 10MHz output refclk for a transverter
   * Instead, have a 25MHz ref input, and use a LeoBodnar reference
 
+* Very good [explanations](https://groups.io/g/BITX20/topic/si5351a_facts_and_myths/5430607) about DDS vs DPLL from Hans Summers
+
 TODO before ordering the PCB
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