diff --git a/lib/licenses.nix b/lib/licenses.nix
index 1fdcc15fd725..29d6abf3648b 100644
--- a/lib/licenses.nix
+++ b/lib/licenses.nix
@@ -2,7 +2,7 @@
 let
 
   spdx = lic: lic // {
-    url = "http://spdx.org/licenses/${lic.spdxId}";
+    url = "http://spdx.org/licenses/${lic.spdxId}.html";
   };
 
 in
@@ -564,6 +564,11 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
     fullName = "Vovida Software License v1.0";
   };
 
+  watcom = spdx {
+    spdxId = "Watcom-1.0";
+    fullName = "Sybase Open Watcom Public License 1.0";
+  };
+
   w3c = spdx {
     spdxId = "W3C";
     fullName = "W3C Software Notice and License";
@@ -598,5 +603,4 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
     spdxId = "ZPL-2.1";
     fullName = "Zope Public License 2.1";
   };
-
 }