diff --git a/doc/license.txt b/doc/license.txt
new file mode 100644
index 0000000000..1bd6c25f9c
--- /dev/null
+++ b/doc/license.txt
@@ -0,0 +1,2 @@
+Unless noted otherwise, PLT Documentations are all distributed under
+the terms of the LGPL.  See release-notes/COPYING.LIB.