diff --git a/stfalconpricerangebar/src/main/java/com/stfalcon/pricerangebar/RangeBarWithChart.kt b/stfalconpricerangebar/src/main/java/com/stfalcon/pricerangebar/RangeBarWithChart.kt
index d942756..5c2f31c 100644
--- a/stfalconpricerangebar/src/main/java/com/stfalcon/pricerangebar/RangeBarWithChart.kt
+++ b/stfalconpricerangebar/src/main/java/com/stfalcon/pricerangebar/RangeBarWithChart.kt
@@ -31,7 +31,7 @@ import com.stfalcon.pricerangebar.model.BarEntry
 import kotlinx.android.synthetic.main.item_range_bar.view.*
 import java.util.*
 
-class RangeBarWithChart @JvmOverloads constructor(
+open class RangeBarWithChart @JvmOverloads constructor(
     context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
 ) : ConstraintLayout(context, attrs, defStyleAttr),
     SimpleRangeView.OnTrackRangeListener {
@@ -423,4 +423,4 @@ class RangeBarWithChart @JvmOverloads constructor(
 
         typedArray.recycle()
     }
-}
\ No newline at end of file
+}