diff --git a/metrics-clojure-core/src/metrics/timers.clj b/metrics-clojure-core/src/metrics/timers.clj
index 3628c86..935d854 100644
--- a/metrics-clojure-core/src/metrics/timers.clj
+++ b/metrics-clojure-core/src/metrics/timers.clj
@@ -2,7 +2,7 @@
   (:require [metrics.core :refer [default-registry metric-name]]
             [metrics.utils :refer [get-percentiles desugared-title snapshot]])
   (:import [com.codahale.metrics MetricRegistry Reservoir Timer Timer$Context]
-           java.util.concurrent.TimeUnit))
+           [java.util.concurrent TimeUnit]))
 
 
 (defn ^com.codahale.metrics.Timer timer
@@ -120,6 +120,9 @@
   [^Timer t ^clojure.lang.IFn f]
   (.time t ^Callable f))
 
+(defn update! [^Timer t ^long duration, ^TimeUnit unit]
+  (.update t duration unit))
+
 (defn start
   "Start a timer, returning the context object that will be used to
   stop this particular instance."
diff --git a/metrics-clojure-core/test/metrics/test/timers_test.clj b/metrics-clojure-core/test/metrics/test/timers_test.clj
index afb6074..c31097c 100644
--- a/metrics-clojure-core/test/metrics/test/timers_test.clj
+++ b/metrics-clojure-core/test/metrics/test/timers_test.clj
@@ -2,7 +2,8 @@
   (:require [metrics.core :as mc]
             [metrics.timers :as mt]
             [metrics.test.test-utils :refer :all]
-            [clojure.test :refer :all]))
+            [clojure.test :refer :all])
+  (:import [java.util.concurrent TimeUnit]))
 
 (def ^:const expiration-delay 6000)
 
@@ -18,7 +19,7 @@
 
 (let [reg (mc/new-registry)]
   (mt/deftimer reg ["test" "timers" "deftimered"])
-  (mt/deftimer reg (mc/uniform-reservior) deftimered-3-arity)
+  (mt/deftimer reg (mc/uniform-reservoir) deftimered-3-arity)
 
   (deftest test-deftimer
     (is (= (mt/rate-mean deftimered) 0.0))
@@ -116,3 +117,11 @@
       (is (= java.lang.Long
              (.getClass (mt/number-recorded t)))))))
 
+(deftest test-update-timer
+  (let [r (mc/new-registry)
+        t (mt/timer r ["test" "timers" "test-update-timer"])
+        expected-time 666
+        expected-time-unit TimeUnit/SECONDS]
+    (is (= 0 (mt/largest t)))
+    (mt/update! t expected-time expected-time-unit)
+    (is (= (.toNanos expected-time-unit expected-time) (mt/largest t)))))
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