diff --git a/src/_locales/en/messages.json b/src/_locales/en/messages.json
index adb9a7d..bdd1757 100644
--- a/src/_locales/en/messages.json
+++ b/src/_locales/en/messages.json
@@ -95,17 +95,14 @@
   "isDisabledInTextFieldsCaptionLabel": {
     "message": "Don't display translation button or panel when selecting text in a text field."
   },
-  "ifOnlyTranslateWhenShiftPressedLabel": {
-    "message": "Translate on specified key pressed"
+  "ifOnlyTranslateWhenModifierKeyPressedLabel": {
+    "message": "Translate on modifier key pressed"
   },
-  "ifOnlyTranslateWhenShiftPressedCaptionLabel": {
-    "message": "Only display translation on Shift key pressed"
+  "ifOnlyTranslateWhenModifierKeyPressedCaptionLabel": {
+    "message": "Only display translation on specified modifier key pressed"
   },
-  "specifiedKeyLabel": {
-    "message": "Specified Key"
-  },
-  "specifyKeyLabel": {
-    "message": "Specify Key"
+  "modifierKeyLabel": {
+    "message": "Modifier Key"
   },
   "shiftLabel": {
     "message": "Shift"
diff --git a/src/content/index.js b/src/content/index.js
index cabff64..e112202 100644
--- a/src/content/index.js
+++ b/src/content/index.js
@@ -38,9 +38,9 @@ const handleMouseUp = async e => {
     if (isInContentEditable()) return;
   }
 
-  if (getSettings("ifOnlyTranslateWhenShiftPressed")) {
-    const spKey = getSettings("specifiedKey")
-    switch(spKey){
+  if (getSettings("ifOnlyTranslateWhenModifierKeyPressed")) {
+    const modifierKey = getSettings("modifierKey");
+    switch (modifierKey) {
       case "shift":
         if (!e.shiftKey) return;
         break;
@@ -54,7 +54,7 @@ const handleMouseUp = async e => {
         if (!e.metaKey) return;
         break;
       default:
-          break;
+        break;
     }
   }
 
diff --git a/src/settings/defaultSettings.js b/src/settings/defaultSettings.js
index da9ca8d..885f34f 100644
--- a/src/settings/defaultSettings.js
+++ b/src/settings/defaultSettings.js
@@ -88,20 +88,20 @@ export default [
         ]
       },
       {
-        title: "specifiedKeyLabel",
+        title: "modifierKeyLabel",
         captions: [],
         type: "none",
-        childElements:[
+        childElements: [
           {
-            id: "ifOnlyTranslateWhenShiftPressed",
-            title: "ifOnlyTranslateWhenShiftPressedLabel",
-            captions: ["ifOnlyTranslateWhenShiftPressedCaptionLabel"],
+            id: "ifOnlyTranslateWhenModifierKeyPressed",
+            title: "ifOnlyTranslateWhenModifierKeyPressedLabel",
+            captions: ["ifOnlyTranslateWhenModifierKeyPressedCaptionLabel"],
             type: "checkbox",
             default: false
           },
           {
-            id: "specifiedKey",
-            title: "specifiedKeyLabel",
+            id: "modifierKey",
+            title: "modifierKeyLabel",
             captions: [],
             type: "select",
             default: "shift",