diff --git a/.vitepress/config.ts b/.vitepress/config.ts
index 140c2f0d..edb81572 100644
--- a/.vitepress/config.ts
+++ b/.vitepress/config.ts
@@ -130,18 +130,18 @@ export default defineConfigWithTheme<ThemeConfig>({
 });
 
 function getAnalyticsTags(env: NodeJS.ProcessEnv): HeadConfig[] {
-  if (!env.VITE_GTM_ID) {
+  if (!env.VITE_GTAG_ID) {
     return [];
   }
   return [
     [
       'script',
-      { src: `https://www.googletagmanager.com/gtag/js?id=${env.VITE_GTM_ID}`, async: '' },
+      { src: `https://www.googletagmanager.com/gtag/js?id=${env.VITE_GTAG_ID}`, async: '' },
     ],
     [
       'script',
       {},
-      `function gtag(){dataLayer.push(arguments)}window.dataLayer=window.dataLayer||[],gtag('js',new Date),gtag('config','${env.VITE_GTM_ID}',{anonymize_ip:true})`,
+      `function gtag(){dataLayer.push(arguments)}window.dataLayer=window.dataLayer||[],gtag('js',new Date),gtag('config','${env.VITE_GTAG_ID}',{anonymize_ip:true})`,
     ],
   ];
 }
diff --git a/README.md b/README.md
index 5ff51132..5884aad4 100644
--- a/README.md
+++ b/README.md
@@ -105,7 +105,7 @@ For production, the docs expect the following environment variables to be define
 
 - `VITE_ALGOLIA_ID`: Algolia `appId`.
 - `VITE_ALGOLIA_KEY`: Algolia `apiKey`.
-- `VITE_GTM_ID`: Google Tag Manager id.
+- `VITE_GTAG_ID`: Google Analytics id.
 
 They can be defined in CI server configuration, or in a `.env` file:
 
@@ -113,7 +113,7 @@ They can be defined in CI server configuration, or in a `.env` file:
 # .env
 VITE_ALGOLIA_ID='******'
 VITE_ALGOLIA_KEY='******'
-VITE_GTM_ID='******'
+VITE_GTAG_ID='******'
 ```
 
 ---