diff --git a/LICENSE.txt b/LICENSE.txt
index db94f20e3eb..986bdb1bba3 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -292,6 +292,42 @@ included:
   details.
 
 
+* Portions of the FFI code for interacting with the native ABI
+  is derived from the Clay programming language, which carries
+  the following license.
+
+    Copyright (C) 2008-2010 Tachyon Technologies.
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with
+    or without modification, are permitted provided that the
+    following conditions are met:
+
+    1. Redistributions of source code must retain the above
+       copyright notice, this list of conditions and the
+       following disclaimer.
+
+    2. Redistributions in binary form must reproduce the
+       above copyright notice, this list of conditions and
+       the following disclaimer in the documentation and/or
+       other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+    PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+    DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+    USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+    USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+    OF SUCH DAMAGE.
+
+
 * Additional copyright may be retained by contributors other
   than Mozilla or the parties enumerated in this file. Such
   copyright can be determined on a case-by-case basis by