diff --git a/hackage-processing.cabal b/hackage-processing.cabal
--- a/hackage-processing.cabal
+++ b/hackage-processing.cabal
@@ -1,12 +1,12 @@
 Name:                hackage-processing
-Version:             0.0
+Version:             0.0.0.1
 Synopsis:            Process 00-index.tar.gz from Hackage
 Description:
   Currently it only contains a program
   for fetching contributions of an author to Hackage
   and format it as a LaTeX table.
   .
-  > hackage-find-contribution thielemann
+  > hackage-find-contribution henning-thielemann.de
 Homepage:            http://hub.darcs.net/thielema/hackage-processing
 License:             BSD3
 License-File:        LICENSE
@@ -17,7 +17,7 @@
 Cabal-Version:       >=1.10
 
 Source-Repository this
-  Tag:         0.0
+  Tag:         0.0.0.1
   Type:        darcs
   Location:    http://hub.darcs.net/thielema/hackage-processing
 
@@ -34,4 +34,4 @@
     Cabal >=1.22 && <2,
     hackage-db >=1.22 && <1.23,
     containers >=0.4 && <0.6,
-    base >=4.5 && <4.9
+    base >=4.5 && <4.10
diff --git a/src/Main.hs b/src/Main.hs
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -25,10 +25,14 @@
 main = do
    [person] <- getArgs
    db <- DB.readHackage
-   let matching =
-         Map.mapMaybe
+   {- |
+   For lazy processing it is important not to flatten the Map with Map.mapMaybe.
+   -}
+   let scanned =
+         Map.map
             (fmap fst . Map.maxViewWithKey .
              Map.filter (hasContributor person)) db
-   Fold.sequence_ $ flip Map.mapWithKey matching $ \pkgName (version, pkg) ->
+   Fold.sequence_ $ flip Map.mapWithKey scanned $ \pkgName maybeMatching ->
+     Fold.forM_ maybeMatching $ \(version, pkg) ->
       printf "%s & %s & %s \\\\\n"
          pkgName (display version) (Pkg.synopsis (Pkg.packageDescription pkg))