diff --git a/prometheus-client.cabal b/prometheus-client.cabal
--- a/prometheus-client.cabal
+++ b/prometheus-client.cabal
@@ -1,5 +1,5 @@
 name:                prometheus-client
-version:             1.0.0.1
+version:             1.0.1
 synopsis:            Haskell client library for http://prometheus.io.
 description:         Haskell client library for http://prometheus.io.
 homepage:            https://github.com/fimad/prometheus-haskell
diff --git a/src/Prometheus.hs b/src/Prometheus.hs
--- a/src/Prometheus.hs
+++ b/src/Prometheus.hs
@@ -117,6 +117,7 @@
 -- >>> getHistogram myHistogram
 -- fromList [(5.0e-3,1),(1.0e-2,0),(2.5e-2,0),(5.0e-2,0),(0.1,0),(0.25,0),(0.5,0),(1.0,0),(2.5,0),(5.0,0),(10.0,0)]
 ,   Histogram
+,   Bucket
 ,   histogram
 ,   defaultBuckets
 ,   exponentialBuckets
diff --git a/src/Prometheus/Metric/Histogram.hs b/src/Prometheus/Metric/Histogram.hs
--- a/src/Prometheus/Metric/Histogram.hs
+++ b/src/Prometheus/Metric/Histogram.hs
@@ -3,6 +3,7 @@
 
 module Prometheus.Metric.Histogram (
     Histogram
+,   Bucket
 ,   histogram
 ,   defaultBuckets
 ,   exponentialBuckets