diff --git a/extension/command/help.js b/extension/command/help.js
index 90cdeea..0e4dce1 100644
--- a/extension/command/help.js
+++ b/extension/command/help.js
@@ -11,7 +11,7 @@ export default class HelpCommand extends Command {
             "tips1": `Tips: You can use shortcut <match>Cmd</match>/<match>Ctrl</match> + <match>L</match> to autofocus the address bar`,
             "tips2": `Tips: Combine <match>Cmd</match> or <match>Alt</match> with <match>Enter</match> to open the search result in the new tab`,
             ":": `Prefix <match>:</match> to execute command (:cargo, :book, :yet, :stable, etc)`,
-            "/": `Prefix <match>/</match> to search nightly rust docs, prefix <match>//</match> to search nightly rustc docs`,
+            "/": `Prefix <match>/</match> to search nightly rust docs`,
             "!": `Prefix <match>!</match> to search docs.rs, prefix <match>!!</match> to search crates.io, prefix <match>!!!</match> can redirect to the repository`,
             "~": `Prefix <match>~</match> to search external crate's docs`,
             "@": `Prefix <match>@crate</match> (<dim>e.g. @tokio</dim>) to search that crate's doc exclusively`,
diff --git a/extension/script/rustc.js b/extension/script/rustc.js
deleted file mode 100644
index 803506c..0000000
--- a/extension/script/rustc.js
+++ /dev/null
@@ -1,35 +0,0 @@
-document.addEventListener("DOMContentLoaded", () => {
-    // Ignore all non-rust doc pages.
-    if (!isRustDoc()) return;
-
-    // rustc search index is a memory cache, therefore we don't use localStorage
-    // to store the cached-version. Instead, we use `rustc:check` action.
-    chrome.runtime.sendMessage({ action: "rustc:check" },
-        response => {
-            let now = new Date();
-            let today = new Date(now.getFullYear(), now.getMonth(), now.getDate(), 0, 0, 0);
-            if (response?.version && today <= Date.parse(response.version)) {
-                // Check version to ensure update search index once a day.
-                return;
-            }
-            injectScripts(["script/add-search-index.js"]);
-        }
-    );
-});
-
-window.addEventListener("message", function (event) {
-    if (event.source === window &&
-        event.data &&
-        event.data.direction === "rust-search-extension:rustc") {
-        console.log(event.data);
-        let now = new Date();
-        let version = `${now.getFullYear()}-${now.getMonth() + 1}-${now.getDate()}`;
-        // rustc search index is a memory cache, therefore we don't use localStorage
-        // to store the cached-version. Instead, we use `rustc:check` action, see above.
-        chrome.runtime.sendMessage({ action: "rustc:add", version, ...event.data.message },
-            (response) => {
-                console.log(response);
-            }
-        );
-    }
-});
\ No newline at end of file
diff --git a/manifest.jsonnet b/manifest.jsonnet
index 7d69152..0f41dca 100644
--- a/manifest.jsonnet
+++ b/manifest.jsonnet
@@ -52,11 +52,6 @@ json
   css=['script/doc-rust-lang-org.css', 'script/details-toggle.css'],
   exclude_matches=['*://doc.rust-lang.org/nightly/nightly-rustc/*'],
 )
-.addContentScript(
-  matches=['*://doc.rust-lang.org/nightly/nightly-rustc/*'],
-  js=utils.js_files('script', ['lib', 'rustc', 'rust-src-navigate']),
-  css=['script/details-toggle.css'],
-)
 .addContentScript(
   matches=['*://rust.extension.sh/update'],
   js=['content-script-bundle.js'] + utils.js_files('script', ['rust-extension-sh']),