diff --git a/doc/configuration.xml b/doc/configuration.xml
index ac03b42714c..55c5ea809d3 100644
--- a/doc/configuration.xml
+++ b/doc/configuration.xml
@@ -55,6 +55,10 @@ configuration file located at
+Note that we are not able to test or build unfree software on Hydra
+due to policy. Most unfree licenses prohibit us from either executing or
+distributing the software.
+
Installing broken packages