Explain why we cannot unbundle hsqldb

libreoffice.spec

@@ -84,8 +84,11 @@ Source8:        libreoffice-multiliblauncher.sh
 
 Source9:        %{external_url}/dtoa-20180411.tgz
 Source11:       %{external_url}/a7983f859eafb2677d7ff386a023bc40-xsltml_2.1.2.zip
-#Unfortunately later versions of hsqldb changed the file format, so if we use a later version we lose
-#backwards compatability.
+
+# Unfortunately later versions of hsqldb changed the file format, so if we use a later version we lose
+# backwards compatability.
+# LibreOffice is also pinned to use hsqldb really old version 1.8.0 so there's currently no way building
+# with system provided hsqldb without major hacking.
 Source12:       %{external_url}/17410483b5b5f267aa18b7e00b65e6e0-hsqldb_1_8_0.zip
 Source13:       %{external_url}/../extern/f543e6e2d7275557a839a164941c0a86e5f2c3f2a0042bfc434c88c6dde9e140-opens___.ttf
 %global bundling_options %{?bundling_options} --without-system-hsqldb