diff --git a/hystrix-contrib/hystrix-metrics-event-stream/src/main/java/com/netflix/hystrix/contrib/metrics/eventstream/HystrixMetricsPoller.java b/hystrix-contrib/hystrix-metrics-event-stream/src/main/java/com/netflix/hystrix/contrib/metrics/eventstream/HystrixMetricsPoller.java
index 40a414516..1ae2d05d0 100644
--- a/hystrix-contrib/hystrix-metrics-event-stream/src/main/java/com/netflix/hystrix/contrib/metrics/eventstream/HystrixMetricsPoller.java
+++ b/hystrix-contrib/hystrix-metrics-event-stream/src/main/java/com/netflix/hystrix/contrib/metrics/eventstream/HystrixMetricsPoller.java
@@ -70,8 +70,7 @@ public class HystrixMetricsPoller {
      * <p>
      * Use <code>pause</code> to temporarily stop polling that can be restarted again with <code>start</code>.
      * 
-     * @param MetricsAsJsonPollerListener
-     *            for callbacks
+     * @param listener for callbacks
      * @param delay
      */
     public HystrixMetricsPoller(MetricsAsJsonPollerListener listener, int delay) {
@@ -221,6 +220,7 @@ private String getCommandJson(HystrixCommandMetrics commandMetrics) throws IOExc
             json.writeNumberField("rollingCountTimeout", commandMetrics.getRollingCount(HystrixRollingNumberEvent.TIMEOUT));
 
             json.writeNumberField("currentConcurrentExecutionCount", commandMetrics.getCurrentConcurrentExecutionCount());
+            json.writeNumberField("rollingMaxConcurrentExecutionCount", commandMetrics.getRollingMaxConcurrentExecutions());
 
             // latency percentiles
             json.writeNumberField("latencyExecute_mean", commandMetrics.getExecutionTimeMean());
diff --git a/hystrix-contrib/hystrix-rx-netty-metrics-stream/src/main/java/com/netflix/hystrix/contrib/rxnetty/metricsstream/JsonMappers.java b/hystrix-contrib/hystrix-rx-netty-metrics-stream/src/main/java/com/netflix/hystrix/contrib/rxnetty/metricsstream/JsonMappers.java
index 947b8c20f..7eddb574a 100644
--- a/hystrix-contrib/hystrix-rx-netty-metrics-stream/src/main/java/com/netflix/hystrix/contrib/rxnetty/metricsstream/JsonMappers.java
+++ b/hystrix-contrib/hystrix-rx-netty-metrics-stream/src/main/java/com/netflix/hystrix/contrib/rxnetty/metricsstream/JsonMappers.java
@@ -84,6 +84,7 @@ static String toJson(HystrixCommandMetrics commandMetrics) throws IOException {
         json.writeNumberField("rollingCountTimeout", commandMetrics.getRollingCount(HystrixRollingNumberEvent.TIMEOUT));
 
         json.writeNumberField("currentConcurrentExecutionCount", commandMetrics.getCurrentConcurrentExecutionCount());
+        json.writeNumberField("rollingMaxConcurrentExecutionCount", commandMetrics.getRollingMaxConcurrentExecutions());
 
         // latency percentiles
         json.writeNumberField("latencyExecute_mean", commandMetrics.getExecutionTimeMean());
diff --git a/hystrix-core/src/main/java/com/netflix/hystrix/AbstractCommand.java b/hystrix-core/src/main/java/com/netflix/hystrix/AbstractCommand.java
index de4f8cca8..8de109fa2 100644
--- a/hystrix-core/src/main/java/com/netflix/hystrix/AbstractCommand.java
+++ b/hystrix-core/src/main/java/com/netflix/hystrix/AbstractCommand.java
@@ -496,7 +496,7 @@ public void call() {
      */
     private Observable<R> getRunObservableDecoratedForMetricsAndErrorHandling() {
         final AbstractCommand<R> _self = this;
-        // allow tracking how many concurrent threads are executing
+        // allow tracking how many concurrent commands are executing
         metrics.incrementConcurrentExecutionCount();
 
         final HystrixRequestContext currentRequestContext = HystrixRequestContext.getContextForCurrentThread();
diff --git a/hystrix-core/src/main/java/com/netflix/hystrix/HystrixCommandMetrics.java b/hystrix-core/src/main/java/com/netflix/hystrix/HystrixCommandMetrics.java
index caddc270d..aca69f56b 100644
--- a/hystrix-core/src/main/java/com/netflix/hystrix/HystrixCommandMetrics.java
+++ b/hystrix-core/src/main/java/com/netflix/hystrix/HystrixCommandMetrics.java
@@ -288,22 +288,23 @@ public int getCurrentConcurrentExecutionCount() {
 
     /**
      * Increment concurrent requests counter.
-     * 
-     * @param numberOfPermitsUsed
      */
     /* package */void incrementConcurrentExecutionCount() {
-        concurrentExecutionCount.incrementAndGet();
+        int numConcurrent = concurrentExecutionCount.incrementAndGet();
+        counter.updateRollingMax(HystrixRollingNumberEvent.COMMAND_MAX_ACTIVE, (long) numConcurrent);
     }
     
     /**
-     * Increment concurrent requests counter.
-     * 
-     * @param numberOfPermitsUsed
+     * Decrement concurrent requests counter.
      */
     /* package */void decrementConcurrentExecutionCount() {
         concurrentExecutionCount.decrementAndGet();
     }
 
+    public long getRollingMaxConcurrentExecutions() {
+        return counter.getRollingMaxValue(HystrixRollingNumberEvent.COMMAND_MAX_ACTIVE);
+    }
+
     /**
      * When a {@link HystrixCommand} returns a Fallback successfully.
      */
diff --git a/hystrix-core/src/main/java/com/netflix/hystrix/util/HystrixRollingNumberEvent.java b/hystrix-core/src/main/java/com/netflix/hystrix/util/HystrixRollingNumberEvent.java
index 4f713bea7..1da134e7e 100644
--- a/hystrix-core/src/main/java/com/netflix/hystrix/util/HystrixRollingNumberEvent.java
+++ b/hystrix-core/src/main/java/com/netflix/hystrix/util/HystrixRollingNumberEvent.java
@@ -30,7 +30,7 @@
  */
 public enum HystrixRollingNumberEvent {
     SUCCESS(1), FAILURE(1), TIMEOUT(1), SHORT_CIRCUITED(1), THREAD_POOL_REJECTED(1), SEMAPHORE_REJECTED(1), BAD_REQUEST(1),
-    FALLBACK_SUCCESS(1), FALLBACK_FAILURE(1), FALLBACK_REJECTION(1), EXCEPTION_THROWN(1),
+    FALLBACK_SUCCESS(1), FALLBACK_FAILURE(1), FALLBACK_REJECTION(1), EXCEPTION_THROWN(1), COMMAND_MAX_ACTIVE(2),
     THREAD_EXECUTION(1), THREAD_MAX_ACTIVE(2), COLLAPSED(1), RESPONSE_FROM_CACHE(1),
     COLLAPSER_REQUEST_BATCHED(1), COLLAPSER_BATCH(1);