diff --git a/RELICENSE/sonoware.md b/RELICENSE/sonoware.md
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+# Permission to Relicense under MPLv2
+
+This is a statement by sonoware GmbH that grants permission to relicense its
+copyrights in the libzmq C++ library (ZeroMQ) under the Mozilla Public License
+v2 (MPLv2).
+
+A portion of the commits made by the Github handle "sonoware", with commit author
+"Stephan Senkbeil" are copyright of sonoware GmbH. 
+This document hereby grants the libzmq project team to relicense libzmq, including
+all past, present and future contributions of the authors listed above.
+
+Stephan Senkbeil <stephan.senkbeil@sonoware.de>
+2019/12/13