diff --git a/.travis.yml b/.travis.yml
index 021c409..86e4aa4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,9 +21,9 @@ script:
   - "$GOPATH/bin/goveralls -coverprofile=coverage.out -service=travis-ci -repotoken $COVERALLS_REPO_TOKEN"
 
 before_deploy:
-  - cd cmd/goexec
-  - GOOS=linux GOARCH=amd64 go build -o goexec_linux_amd64
-  - GOOS=darwin GOARCH=amd64 go build -o goexec_darwin_amd64
+  - cd cmd/fastexec
+  - GOOS=linux GOARCH=amd64 go build -o fastexec_linux_amd64
+  - GOOS=darwin GOARCH=amd64 go build -o fastexec_darwin_amd64
 
 deploy:
   skip_cleanup: true
@@ -31,8 +31,8 @@ deploy:
   api_key:
     secure: 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
   file:
-  - goexec_linux_amd64
-  - goexec_darwin_amd64
+  - fastexec_linux_amd64
+  - fastexec_darwin_amd64
   on:
     tags: true
 
diff --git a/README.md b/README.md
index eb813bd..12d091c 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# fastexec
+# Fastexec
 
 [![GoReportCard Widget]][GoReportCard] [![Travis Widget]][Travis] [![Coverage Status Widget]][Coverage Status]
 
@@ -8,3 +8,56 @@
 [Travis Widget]: https://travis-ci.org/unicell/fastexec.svg?branch=master
 [Coverage Status]: https://coveralls.io/github/unicell/fastexec
 [Coverage Status Widget]: https://coveralls.io/repos/github/unicell/fastexec/badge.svg
+
+<hr>
+
+### About
+
+Fastexec is a tool to parallelly run shell command on data subset.
+
+The idea is simple, fastexec takes data from standard input, divide it into
+small chunks, pass it to workers running command line in parallel. And then it
+will return the combined result from all workers.
+
+### Examples
+
+Run 1000 workers to curl URLs from the url_list.txt and output response code,
+time cost for name resolution, connection and for entire request.
+
+```bash
+cat url_list.txt | fastexec -workers 10000 xargs curl -sL \
+-w "%{http_code} %{time_namelookup} %{time_connect} %{time_total} %{url_effective}\\n" -o /dev/null
+```
+
+Parallelly run fping with 400 workers, and each takes 20 IPs from the
+ip_list.txt. Fping will be triggered with `-t 1000` (1000 millisec timeout) and
+all workers share the 1000 IP/s (1000 line of data / sec) rate limit.
+
+```bash
+cat ip_list.txt | fastexec -chunks 20 -workers 400 -ratelimit 1000 fping -t 1000
+```
+
+### Usage
+
+```bash
+  -alsologtostderr
+        log to standard error as well as files
+  -chunks int
+        size of data chunk for one job (default 1)
+  -log_backtrace_at value
+        when logging hits line file:N, emit a stack trace (default :0)
+  -log_dir string
+        If non-empty, write log files in this directory
+  -logtostderr
+        log to standard error instead of files
+  -ratelimit int
+        data processing ratelimit / sec (default -1)
+  -stderrthreshold value
+        logs at or above this threshold go to stderr
+  -v value
+        log level for V logs
+  -vmodule value
+        comma-separated list of pattern=N settings for file-filtered logging
+  -workers int
+        num of workers (default 1)
+```
diff --git a/cmd/goexec/goexec.go b/cmd/fastexec/fastexec.go
similarity index 100%
rename from cmd/goexec/goexec.go
rename to cmd/fastexec/fastexec.go