diff --git a/Example/FSPopoverView.xcworkspace/xcuserdata/sheng.xcuserdatad/UserInterfaceState.xcuserstate b/Example/FSPopoverView.xcworkspace/xcuserdata/sheng.xcuserdatad/UserInterfaceState.xcuserstate
index 34fc4e6..a4ad9d7 100644
Binary files a/Example/FSPopoverView.xcworkspace/xcuserdata/sheng.xcuserdatad/UserInterfaceState.xcuserstate and b/Example/FSPopoverView.xcworkspace/xcuserdata/sheng.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/Example/FSPopoverView/Base.lproj/Main.storyboard b/Example/FSPopoverView/Base.lproj/Main.storyboard
index c5ca3d5..69a8d6f 100644
--- a/Example/FSPopoverView/Base.lproj/Main.storyboard
+++ b/Example/FSPopoverView/Base.lproj/Main.storyboard
@@ -22,7 +22,7 @@
                         <subviews>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="xfz-lV-QsB">
                                 <rect key="frame" x="154" y="390.66666666666669" width="67" height="31"/>
-                                <color key="backgroundColor" systemColor="systemMintColor"/>
+                                <color key="backgroundColor" systemColor="systemGray5Color"/>
                                 <state key="normal" title="Button"/>
                                 <buttonConfiguration key="configuration" style="plain" title="Button"/>
                                 <connections>
@@ -43,8 +43,8 @@
         </scene>
     </scenes>
     <resources>
-        <systemColor name="systemMintColor">
-            <color red="0.0" green="0.7803921568627451" blue="0.74509803921568629" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+        <systemColor name="systemGray5Color">
+            <color red="0.89803921568627454" green="0.89803921568627454" blue="0.91764705882352937" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
         </systemColor>
     </resources>
 </document>
diff --git a/Example/FSPopoverView/ViewController.swift b/Example/FSPopoverView/ViewController.swift
index 7cf0093..9011fc7 100644
--- a/Example/FSPopoverView/ViewController.swift
+++ b/Example/FSPopoverView/ViewController.swift
@@ -28,10 +28,11 @@ class ViewController: UIViewController {
         guard let button = sender as? UIButton else { return }
         let popoverView = FSPopoverView()
         popoverView.dataSource = self
-        popoverView.borderWidth = 2.0
+//        popoverView.borderWidth = 1.0
         popoverView.borderColor = .red
         popoverView.shadowColor = .green
         popoverView.shadowRadius = 3.0
+        popoverView.shadowOpacity = 0.6
 //        popoverView.arrowDirection = .right
 //        popoverView.autosetsArrowDirection = false
         popoverView.showTo(button)
diff --git a/FSPopoverView/Classes/FSPopoverView.swift b/FSPopoverView/Classes/FSPopoverView.swift
index 4b62e5d..98fcdfe 100644
--- a/FSPopoverView/Classes/FSPopoverView.swift
+++ b/FSPopoverView/Classes/FSPopoverView.swift
@@ -95,6 +95,9 @@ open class FSPopoverView: UIView {
     final weak public private(set) var containerView: UIView?
     
     /// The color of the popover view border.
+    ///
+    /// * A reload request will be set when this property is changed.
+    ///
     final public var borderColor: UIColor? {
         didSet {
             setNeedsReload()
@@ -102,6 +105,9 @@ open class FSPopoverView: UIView {
     }
     
     /// The width of the popover view border.
+    ///
+    /// * A reload request will be set when this property is changed.
+    ///
     final public var borderWidth: CGFloat = 0.0 {
         didSet {
             if borderWidth != oldValue {
@@ -111,6 +117,9 @@ open class FSPopoverView: UIView {
     }
     
     /// The color of the popover view shadow.
+    ///
+    /// * A reload request will be set when this property is changed.
+    ///
     final public var shadowColor: UIColor? {
         didSet {
             setNeedsReload()
@@ -118,6 +127,9 @@ open class FSPopoverView: UIView {
     }
     
     /// The radius of the popover view shadow.
+    ///
+    /// * A reload request will be set when this property is changed.
+    ///
     final public var shadowRadius: CGFloat = 0.0 {
         didSet {
             if shadowRadius != oldValue {
@@ -129,6 +141,9 @@ open class FSPopoverView: UIView {
     /// The opacity of the popover view shadow.
     /// The value in this property must be in the range 0.0 (transparent) to 1.0 (opaque).
     /// Defaults to 1.0.
+    ///
+    /// * A reload request will be set when this property is changed.
+    /// 
     final public var shadowOpacity: Float = 1.0 {
         didSet {
             if shadowOpacity != oldValue {
@@ -639,5 +654,5 @@ public extension FSPopoverView {
 
 private struct _Consts {
     static let cornerRadius: CGFloat = 6.0
-    static let arrowSize = CGSize(width: 30.0, height: 14.0)
+    static let arrowSize = CGSize(width: 20.0, height: 10.0)
 }