diff --git a/pkg/models/pools.go b/pkg/models/pools.go
index e1a6683..0b4dad6 100644
--- a/pkg/models/pools.go
+++ b/pkg/models/pools.go
@@ -1,9 +1,16 @@
 package models
 
+type PoolCategory string
+
+const (
+	Series     PoolCategory = "series"
+	Collection PoolCategory = "collection"
+)
+
 type Pool struct {
 	BaseModel[PoolID]
-	Name     string `json:"name" gorm:"type:varchar(25)"`
-	Category string `json:"category" gorm:"type:pool_category;type:enum('series', 'collection')"`
+	Name     string       `json:"name" gorm:"type:varchar(25)"`
+	Category PoolCategory `json:"category" gorm:"type:pool_category;type:enum('series', 'collection')"`
 }
 
 func (Pool) TableName() string {