diff --git a/prometheus.cabal b/prometheus.cabal
--- a/prometheus.cabal
+++ b/prometheus.cabal
@@ -1,5 +1,5 @@
 name:                prometheus
-version:             2.1.0
+version:             2.1.1
 synopsis:            Prometheus Haskell Client
 homepage:            http://github.com/bitnomial/prometheus
 bug-reports:         http://github.com/bitnomial/prometheus/issues
@@ -77,7 +77,7 @@
                  , System.Metrics.Prometheus.Registry
                  , System.Metrics.Prometheus.RegistryT
 
-  build-depends: base           >= 4.7  && < 4.12
+  build-depends: base           >= 4.7  && < 4.13
                , atomic-primops >= 0.8  && < 0.9
                , bytestring     >= 0.10 && < 0.11
                , containers     >= 0.5  && < 0.6
diff --git a/src/System/Metrics/Prometheus/Http/Scrape.hs b/src/System/Metrics/Prometheus/Http/Scrape.hs
--- a/src/System/Metrics/Prometheus/Http/Scrape.hs
+++ b/src/System/Metrics/Prometheus/Http/Scrape.hs
@@ -31,6 +31,12 @@
 import           System.Metrics.Prometheus.Registry             (RegistrySample)
 
 
+-- | The HTTP web route on which to serve data
+--
+-- For example:
+--
+-- * @http://localhost:9090/metrics@ should use a path of @["metrics"]@.
+-- * @http://localhost/@ should use a path of @[]@.
 type Path = [Text]