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diff --git a/doc/eris.adoc b/doc/eris.adoc
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--- a/doc/eris.adoc
+++ b/doc/eris.adoc
@@ -126,6 +126,11 @@ If no convergence secret is specified a null convergence secret MUST be used (32
The convergence secret is implemented as the keying feature of the Blake2 cryptographic hash <<RFC7693>>.
+A group using a shared convergence secret can benefit from the advantages of convergenct encryption while being safe against the known attacks from peers that do not know the convergence secret.
=== Encoding
Inputs to the encoding process are: