diff --git a/ekg-rrd.cabal b/ekg-rrd.cabal
--- a/ekg-rrd.cabal
+++ b/ekg-rrd.cabal
@@ -1,5 +1,5 @@
 name:                ekg-rrd
-version:             0.2.0.5
+version:             0.2.0.14
 synopsis:            Passes ekg statistics to rrdtool
 description:         Simple API for passing ekg monitoring statistics to a round-robin database (RRD) using rrdtool.
 homepage:            https://bitbucket.org/davecturner/ekg-rrd
@@ -42,3 +42,15 @@
                     , time
                     , unordered-containers
   ghc-options: -Wall -with-rtsopts=-T
+
+
+source-repository head
+  type: hg
+  location:          https://bitbucket.org/davecturner/ekg-rrd
+
+
+source-repository this
+  type: hg
+  location: https://bitbucket.org/davecturner/ekg-rrd
+  tag: 7b9d021c5a43e4a7ef8b42505a30dd971c9b93f9
+
diff --git a/src/System/Metrics/RRDTool.hs b/src/System/Metrics/RRDTool.hs
--- a/src/System/Metrics/RRDTool.hs
+++ b/src/System/Metrics/RRDTool.hs
@@ -49,7 +49,7 @@
 newRRD
   :: FilePath -- ^ The name of the database file.
   -> IntervalSeconds -- ^ The update interval in seconds.
-  -> Maybe FilePath -- ^ A path to the `rrdtool` binary, or 'Nothing' to search `$PATH` for `rrdtool`.
+  -> Maybe FilePath -- ^ A path to the `rrdtool` binary, or 'Nothing' to simply call `rrdtool`.
   -> [RoundRobinArchive] -- ^ Round-robin archives that define how data is stored.
   -> [DataSource] -- ^ Data sources to define in the database.
   -> IO RoundRobinDatabase