diff --git a/analyse/example_test.go b/analyse/example_test.go
new file mode 100644
index 0000000..3c804e2
--- /dev/null
+++ b/analyse/example_test.go
@@ -0,0 +1,22 @@
+package analyse_test
+
+import (
+	"fmt"
+
+	"github.com/wangbin/jiebago/analyse"
+)
+
+func ExampleExtractTags() {
+	var t analyse.TagExtracter
+	t.LoadDictionary("../dict.txt")
+	t.LoadIdf("idf.txt")
+
+	sentence := "这是一个伸手不见五指的黑夜。我叫孙悟空，我爱北京，我爱Python和C++。"
+	segments := t.ExtractTags(sentence, 5)
+	fmt.Printf("Top %d tags:", len(segments))
+	for _, segment := range segments {
+		fmt.Printf(" %s /", segment.Text())
+	}
+	// Output:
+	// Top 5 tags: Python / C++ / 伸手不见五指 / 孙悟空 / 黑夜 /
+}
diff --git a/analyse/tag_extracker.go b/analyse/tag_extracker.go
index b7836f5..cf68075 100644
--- a/analyse/tag_extracker.go
+++ b/analyse/tag_extracker.go
@@ -1,3 +1,4 @@
+// Package analyse is the Golang implementation of Jieba's analyse module.
 package analyse
 
 import (
diff --git a/analyse/analyse_test.go b/analyse/tag_extracker_test.go
similarity index 100%
rename from analyse/analyse_test.go
rename to analyse/tag_extracker_test.go
diff --git a/posseg/bench.sh b/posseg/bench.sh
deleted file mode 100755
index 03c3a4c..0000000
--- a/posseg/bench.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/sh
-
-go test -run=XXX -v -bench=BenchmarkViterbi -benchtime 10s  -benchmem -memprofile viterbi-mem.out -cpuprofile viterbi-cpu.out
-go tool pprof -png -output ~/tmp/viterbi-cpu.png posseg.test viterbi-cpu.out
-go tool pprof -png -output ~/tmp/viterbi-mem.png posseg.test viterbi-mem.out
diff --git a/posseg/posseg.go b/posseg/posseg.go
index c3b401f..4fc2893 100644
--- a/posseg/posseg.go
+++ b/posseg/posseg.go
@@ -1,3 +1,4 @@
+// Package posseg is the Golang implementation of Jieba's posseg module.
 package posseg
 
 import (