diff --git a/extension/index-manager.js b/extension/index-manager.js
index 5fa286f..b784be6 100644
--- a/extension/index-manager.js
+++ b/extension/index-manager.js
@@ -84,11 +84,11 @@ class IndexManager {
         storage.setItem('index-rustc', index);
     }
 
-    static async getTargetsIndex() {
+    static async getTargetIndex() {
         return await storage.getItem('index-target') || targetsIndex;
     }
 
-    static setTargetsIndex(index) {
+    static setTargetIndex(index) {
         storage.setItem('index-target', index);
     }
 
diff --git a/extension/main.js b/extension/main.js
index 27486c3..b8fe7b0 100644
--- a/extension/main.js
+++ b/extension/main.js
@@ -39,7 +39,7 @@ function getPlatformOs() {
     let labelCommand = new LabelCommand(await IndexManager.getLabelIndex());
     let rfcCommand = new RfcCommand(await IndexManager.getRfcIndex());
     let rustcCommand = new RustcCommand(await IndexManager.getRustcIndex());
-    let targetCommand = new TargetCommand(await IndexManager.getTargetsIndex());
+    let targetCommand = new TargetCommand(await IndexManager.getTargetIndex());
     const cargoCommand = new SimpleCommand('cargo', 'Search useful third-party cargo subcommands.', commandIndex['cargo']);
     const bookCommand = new SimpleCommand('book', 'Search Rust books.', commandIndex['book']);
     const bookZhCommand = new SimpleCommand('book/zh', 'Search Chinese Rust books.', commandIndex['book/zh']);
diff --git a/extension/script/rust-extension-sh.js b/extension/script/rust-extension-sh.js
index e77155c..5878903 100644
--- a/extension/script/rust-extension-sh.js
+++ b/extension/script/rust-extension-sh.js
@@ -6,7 +6,7 @@ window.addEventListener("message", async function (event) {
         console.log('target:', message.target);
         switch (message.target) {
             case 'book': {
-                await IndexManager.setBookIndex(message.index);
+                IndexManager.setBookIndex(message.index);
                 break;
             }
             case 'caniuse': {
@@ -39,7 +39,7 @@ window.addEventListener("message", async function (event) {
                 break;
             }
             case 'target': {
-                IndexManager.setTargetsIndex(message.index);
+                IndexManager.setTargetIndex(message.index);
                 break;
             }
         }