diff --git a/tags/tags.go b/tags/tags.go
index b980eb5..3a3c90d 100644
--- a/tags/tags.go
+++ b/tags/tags.go
@@ -1,22 +1,25 @@
+// Package tags supports operations around hashtags in plain text content
 package tags
 
 import (
 	"github.com/kylemcc/twitter-text-go/extract"
 )
 
+// Extract finds all hashtags in the given string and returns a de-duplicated
+// list of them.
 func Extract(body string) []string {
 	matches := extract.ExtractHashtags(body)
 	tags := map[string]bool{}
 	for i := range matches {
 		// Second value (whether or not there's a hashtag) ignored here, since
 		// we're only extracting hashtags.
 		ht, _ := matches[i].Hashtag()
 		tags[ht] = true
 	}
 
 	resTags := make([]string, 0)
 	for k := range tags {
 		resTags = append(resTags, k)
 	}
 	return resTags
 }