note about the new rev

tahoe-lafs.nix

@@ -10,7 +10,8 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "LeastAuthority";
     repo = "tahoe-lafs";
-    # HEAD of integration/storage-economics branch as of July 15th 2019.
+    # HEAD of an integration branch for all of the storage plugin stuff.  Last
+    # updated August 15th 2019.
     rev = "b35a8908f4096ccae35da78b0e7dde96d6cf1667";
     sha256 = "0n289hzx2s1jvspmpz2c5iwl0dvnfc8qbiqfmpbl88ymrjp7p6rr";
   };