diff --git a/checksum.cabal b/checksum.cabal
--- a/checksum.cabal
+++ b/checksum.cabal
@@ -1,10 +1,12 @@
 Name:                checksum
-Version:             0.0
+Version:             0.0.0.1
 Synopsis:            Compute and verify checksums of ISBN, IBAN, etc.
 Description:
   Compute and verify checksums of various identifiers,
   such as IBAN, ISBN, EAN, Germany's Citizen Card.
-Homepage:            http://hub.darcs.net/thielema/checksum
+  .
+  Related package: @isbn@
+Homepage:            https://hub.darcs.net/thielema/checksum
 License:             BSD3
 License-File:        LICENSE
 Author:              Henning Thielemann
@@ -14,13 +16,13 @@
 Cabal-Version:       >=1.10
 
 Source-Repository this
-  Tag:         0.0
+  Tag:         0.0.0.1
   Type:        darcs
-  Location:    http://hub.darcs.net/thielema/checksum
+  Location:    https://hub.darcs.net/thielema/checksum
 
 Source-Repository head
   Type:        darcs
-  Location:    http://hub.darcs.net/thielema/checksum
+  Location:    https://hub.darcs.net/thielema/checksum
 
 Library
   Exposed-Modules:
@@ -31,7 +33,7 @@
   Other-Modules:
     Math.Checksum.Utility
   Build-Depends:
-    explicit-exception >= 0.1.9 && <0.2,
+    explicit-exception >= 0.1.9 && <0.3,
     utility-ht >=0.0.11 && <0.1,
     base >=4.5 && <5
   Hs-Source-Dirs:      src