diff --git a/ShadowsocksX-NG/Base.lproj/AdvPreferencesWindowController.xib b/ShadowsocksX-NG/Base.lproj/AdvPreferencesWindowController.xib
index e4d375b..874760b 100644
--- a/ShadowsocksX-NG/Base.lproj/AdvPreferencesWindowController.xib
+++ b/ShadowsocksX-NG/Base.lproj/AdvPreferencesWindowController.xib
@@ -43,7 +43,7 @@
                     </textField>
                     <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="wCp-nB-dda">
                         <rect key="frame" x="18" y="308" width="439" height="17"/>
-                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" alignment="center" title="Don't change these preferences if you have no idea what are they." id="8wL-qv-5nD">
+                        <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" alignment="center" title="Don't change these preferences if you have no idea what they are." id="8wL-qv-5nD">
                             <font key="font" metaFont="system"/>
                             <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
                             <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>