Mention all used licenses.
diff --git a/docs/LICENSE.TXT b/docs/LICENSE.TXT
index 102a03d..657b827 100644
--- a/docs/LICENSE.TXT
+++ b/docs/LICENSE.TXT
@@ -20,9 +20,12 @@
GPL. Note that the FTL is incompatible with the GPL due to its
advertisement clause.
-The contributed PCF driver comes with a license similar to that of the X
-Window System. It is compatible to the above two licenses (see file
-src/pcf/readme).
+The contributed BDF and PCF drivers comes with a license similar to that
+of the X Window System. It is compatible to the above two licenses (see
+file src/bdf/README and src/pcf/README).
+
+The gzip module uses the zlib license (see src/gzip/zlib.h) which too is
+compatible to the above two licenses.
--- end of LICENSE.TXT ---