i have one macro as follows

Sub HideRows()
Dim Rng As Range
Set Rng = Sheets("Sheet1").Range("B10")
If Rng.Value = "YES" Then
Rows("11:50").EntireRow.Hidden = False
Range("B11").Select
ElseIf Rng.Value = "NO" Then
Rows("11:50").EntireRow.Hidden = True
Range("B51").Select
End If
End Sub

now i want that whenever i change in the values in cell B10 the said
macro should run. Please help me out