diff --git a/etcdctl/README.md b/etcdctl/README.md
index 16caefa2a..178c41efb 100644
--- a/etcdctl/README.md
+++ b/etcdctl/README.md
@@ -376,7 +376,7 @@ Prints the compacted revision.
 
 ### WATCH [options] [key or prefix] [range_end] [--] [exec-command arg1 arg2 ...]
 
-Watch watches events stream on keys or prefixes, [key or prefix, range_end) if range_end is given. The watch command runs until it encounters an error or is terminated by the user.  If range_end is given, it must be lexicographically greater than key or "\x00".
+Watch watches events stream on keys or prefixes, [key or prefix, range_end) if range_end is given. The watch command runs until it encounters an error or is terminated by the user. If range_end is given, it must be lexicographically greater than key or "\x00".
 
 RPC: Watch
 
@@ -1505,6 +1505,26 @@ CHECK provides commands for checking properties of the etcd cluster.
 
 CHECK PERF checks the performance of the etcd cluster for 60 seconds. Running the `check perf` often can create a large keyspace history which can be auto compacted and defragmented using the `--auto-compact` and `--auto-defrag` options as described below.
 
+Notice that different workload models use different configurations in terms of number of clients and throughtput. Here is the configuration for each load:
+
+
+| Load | Number of clients | Number of put requests (requests/sec) |
+|---------|------|---------|
+| Small   | 50   | 10000   |
+| Medium  | 200  | 100000  |
+| Large   | 500  | 1000000 |
+| xLarge  | 1000 | 3000000 |
+
+The test checks for the following conditions:
+
+- The throughput should be at least 90% of the issued requets
+- All the requests should be done in less than 500 ms
+- The standard deviation of the requests should be less than 100 ms
+
+
+Hence, a workload model may work while another one might fail.
+
+
 RPC: CheckPerf
 
 #### Options
diff --git a/etcdctl/ctlv3/command/check.go b/etcdctl/ctlv3/command/check.go
index 7227b14cd..9cc2689fb 100644
--- a/etcdctl/ctlv3/command/check.go
+++ b/etcdctl/ctlv3/command/check.go
@@ -126,7 +126,7 @@ func NewCheckPerfCommand() *cobra.Command {
 	}
 
 	// TODO: support customized configuration
-	cmd.Flags().StringVar(&checkPerfLoad, "load", "s", "The performance check's workload model. Accepted workloads: s(small), m(medium), l(large), xl(xLarge)")
+	cmd.Flags().StringVar(&checkPerfLoad, "load", "s", "The performance check's workload model. Accepted workloads: s(small), m(medium), l(large), xl(xLarge). Different workload models use different configurations in terms of number of clients and expected throughtput.")
 	cmd.Flags().StringVar(&checkPerfPrefix, "prefix", "/etcdctl-check-perf/", "The prefix for writing the performance check's keys.")
 	cmd.Flags().BoolVar(&autoCompact, "auto-compact", false, "Compact storage with last revision after test is finished.")
 	cmd.Flags().BoolVar(&autoDefrag, "auto-defrag", false, "Defragment storage after test is finished.")