diff --git a/libdigidocpp.spec b/libdigidocpp.spec
index 9549e2b..12a5019 100644
--- a/libdigidocpp.spec
+++ b/libdigidocpp.spec
@@ -54,7 +54,8 @@ The %{name}-doc package contains documentation provided by upstream.
 %setup -q
 # Compatibility macro XALAN_USING_XALAN() was removed in xalan-c 1.12. This
 # workaround is harmless when using older xalan-c versions. See
-# https://issues.apache.org/jira/browse/SANTUARIO-560.
+# https://github.com/open-eid/libdigidocpp/issues/363 and the corresponding
+# xml-security-c issue, https://issues.apache.org/jira/browse/SANTUARIO-560.
 find . -type f -execdir sed -r -i \
     's/XALAN_USING_XALAN\(([^\(\)]+)\);*/using xalanc::\1;/g' '{}' '+'