diff --git a/README.md b/README.md
index bd6703c..6c925ca 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,25 @@
 # MpegTsAnalyzer
 
+MpegTsAnalyzer is the Analyzer of MPEG2 Transport Stream(ISO_IEC_13818-1).
+It can parse TS header, Adaptation Field, PSI(PAT/PMT) and PES header. Then, it can check continuity_counter(TS header), CRC32(PSI). 
+
+
+# Usage
+
+Default, it is dump each timestamps(PCR/PTS/DTS) that include PCR interval and PTS PCR gap. If you want to dump more detail, please add each command line flags.
+
+```
+usage: main.exe [<flags>] <input>
+
+Flags:
+      --help                   Show context-sensitive help (also try --help-long
+                               and --help-man).
+      --dump-ts-header         Dump TS packet header.
+      --dump-ts-payload        Dump TS packet payload binary.
+      --dump-adaptation-field  Dump TS packet adaptation_field detail.
+      --dump-psi               Dump PSI(PAT/PMT) detail.
+  -n, --not-dump-timestamp     Not Dump PCR/PTS/DTS timestamps.
+
+Args:
+  <input>  Input file name.
+```
diff --git a/main.go b/main.go
index 0003db9..213e90a 100644
--- a/main.go
+++ b/main.go
@@ -14,11 +14,11 @@ const tsPacketSize = 188
 func main() {
 	var options options.Options
 	filename := kingpin.Arg("input", "Input file name.").Required().String()
-	options.SetDumpHeader(*kingpin.Flag("dump-ts-header", "").Bool())
-	options.SetDumpPayload(*kingpin.Flag("dump-ts-payload", "").Bool())
-	options.SetDumpAdaptationField(*kingpin.Flag("dump-adaptation-field", "").Bool())
-	options.SetDumpPsi(*kingpin.Flag("dump-psi", "").Bool())
-	options.SetNotDumpTimestamp(*kingpin.Flag("not-dump-timestamp", "").Short('n').Bool())
+	options.SetDumpHeader(*kingpin.Flag("dump-ts-header", "Dump TS packet header.").Bool())
+	options.SetDumpPayload(*kingpin.Flag("dump-ts-payload", "Dump TS packet payload binary.").Bool())
+	options.SetDumpAdaptationField(*kingpin.Flag("dump-adaptation-field", "Dump TS packet adaptation_field detail.").Bool())
+	options.SetDumpPsi(*kingpin.Flag("dump-psi", "Dump PSI(PAT/PMT) detail.").Bool())
+	options.SetNotDumpTimestamp(*kingpin.Flag("not-dump-timestamp", "Not Dump PCR/PTS/DTS timestamps.").Short('n').Bool())
 	kingpin.Parse()
 
 	if err := parseTsFile(*filename, options); err != nil {