diff --git a/example/midlevel/tag.go b/example/midlevel/tag.go
index ed45a85..0784022 100644
--- a/example/midlevel/tag.go
+++ b/example/midlevel/tag.go
@@ -13,8 +13,8 @@ func main() {
 		Client:    http.Client{},
 		Host:      "https://e621.net",
 		UserAgent: "Go-e621-SDK (@username)",
-		Username:  "selloo",                   // Replace with your username
-		APIKey:    "zt7XAaewLqP4AWvQi5WrLNwN", // Replace with your API key
+		Username:  "", // Replace with your username
+		APIKey:    "", // Replace with your API key
 	}
 
 	// Log: Getting a single tag.
diff --git a/pkg/e621/model/tag.go b/pkg/e621/model/tag.go
index f084af2..9851807 100644
--- a/pkg/e621/model/tag.go
+++ b/pkg/e621/model/tag.go
@@ -1,13 +1,26 @@
 package model
 
+type TagCategory int
+
+const (
+	General TagCategory = iota
+	Artist
+	Copyright TagCategory = iota + 1
+	Character
+	Species
+	Invalide
+	Meta
+	Lore
+)
+
 type Tag struct {
-	ID                   int64  `json:"id"`
-	Name                 string `json:"name"`
-	PostCount            int64  `json:"post_count"`
-	RelatedTags          string `json:"related_tags"`
-	RelatedTagsUpdatedAt string `json:"related_tags_updated_at"`
-	Category             int64  `json:"category"`
-	IsLocked             bool   `json:"is_locked"`
-	CreatedAt            string `json:"created_at"`
-	UpdatedAt            string `json:"updated_at"`
+	ID                   int64       `json:"id"`
+	Name                 string      `json:"name"`
+	PostCount            int64       `json:"post_count"`
+	RelatedTags          string      `json:"related_tags"`
+	RelatedTagsUpdatedAt string      `json:"related_tags_updated_at"`
+	Category             TagCategory `json:"category"`
+	IsLocked             bool        `json:"is_locked"`
+	CreatedAt            string      `json:"created_at"`
+	UpdatedAt            string      `json:"updated_at"`
 }