diff --git a/HISTORY.md b/HISTORY.md
index e9698ab3b..c299a0505 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,7 @@
 # Rocksdb Change Log
 ## Unreleased
+### Public API Change
+* For users of `Statistics` objects created via `CreateDBStatistics()`, the format of the string returned by its `ToString()` method has changed.
 
 ## 5.14.0 (5/16/2018)
 ### Public API Change
diff --git a/include/rocksdb/statistics.h b/include/rocksdb/statistics.h
index 1a4f699db..30e79b099 100644
--- a/include/rocksdb/statistics.h
+++ b/include/rocksdb/statistics.h
@@ -619,6 +619,8 @@ struct HistogramData {
   // zero-initialize new members since old Statistics::histogramData()
   // implementations won't write them.
   double max = 0.0;
+  uint64_t count = 0;
+  uint64_t sum = 0;
 };
 
 enum StatsLevel {
diff --git a/monitoring/histogram.cc b/monitoring/histogram.cc
index 4970df7bd..d5ac07c90 100644
--- a/monitoring/histogram.cc
+++ b/monitoring/histogram.cc
@@ -235,6 +235,8 @@ void HistogramStat::Data(HistogramData * const data) const {
   data->max = static_cast<double>(max());
   data->average = Average();
   data->standard_deviation = StandardDeviation();
+  data->count = num();
+  data->sum = sum();
 }
 
 void HistogramImpl::Clear() {
diff --git a/monitoring/statistics.cc b/monitoring/statistics.cc
index 938704312..59ce3d9e0 100644
--- a/monitoring/statistics.cc
+++ b/monitoring/statistics.cc
@@ -169,11 +169,17 @@ std::string StatisticsImpl::ToString() const {
       char buffer[kTmpStrBufferSize];
       HistogramData hData;
       getHistogramImplLocked(h.first)->Data(&hData);
-      snprintf(
+      // don't handle failures - buffer should always be big enough and arguments
+      // should be provided correctly
+      int ret = snprintf(
           buffer, kTmpStrBufferSize,
-          "%s statistics Percentiles :=> 50 : %f 95 : %f 99 : %f 100 : %f\n",
-          h.second.c_str(), hData.median, hData.percentile95,
-          hData.percentile99, hData.max);
+          "%s P50 : %f P95 : %f P99 : %f P100 : %f COUNT : %" PRIu64 " SUM : %"
+          PRIu64 "\n", h.second.c_str(), hData.median, hData.percentile95,
+          hData.percentile99, hData.max, hData.count, hData.sum);
+      if (ret < 0 || ret >= kTmpStrBufferSize) {
+        assert(false);
+        continue;
+      }
       res.append(buffer);
     }
   }