diff --git a/docs/usage/self-hosted-experimental.md b/docs/usage/self-hosted-experimental.md
index bd95401a8cfc64b6e0a3fcc5efebc7457e3bd62f..d7d7348927361d1ea937bac20602ba38692f89f7 100644
--- a/docs/usage/self-hosted-experimental.md
+++ b/docs/usage/self-hosted-experimental.md
@@ -177,6 +177,6 @@ Don't combine with `redisUrl`, Redis would be preferred over SQlite.
 
 Suppress the pre-commit support warning in PR bodies.
 
-## `RENOVATE_X_YARN_IGNORE_PROXY`
+## `RENOVATE_X_YARN_PROXY`
 
-Skip configuring global Yarn proxy settings if HTTP proxy environment variables are detected.
+Configure global Yarn proxy settings if HTTP proxy environment variables are detected.
diff --git a/lib/modules/manager/npm/post-update/yarn.spec.ts b/lib/modules/manager/npm/post-update/yarn.spec.ts
index 54ff7db991df139ceb12bc440e8dd35a69adc05d..d1e01dc27a1e03d57e3b38715bed45e9f984f405 100644
--- a/lib/modules/manager/npm/post-update/yarn.spec.ts
+++ b/lib/modules/manager/npm/post-update/yarn.spec.ts
@@ -48,6 +48,7 @@ describe('modules/manager/npm/post-update/yarn', () => {
     delete process.env.BUILDPACK;
     delete process.env.HTTP_PROXY;
     delete process.env.HTTPS_PROXY;
+    delete process.env.RENOVATE_X_YARN_PROXY;
     Fixtures.reset();
     GlobalConfig.set({ localDir: '.', cacheDir: '/tmp/cache' });
     removeDockerContainer.mockResolvedValue();
@@ -152,6 +153,7 @@ describe('modules/manager/npm/post-update/yarn', () => {
   it('sets http proxy', async () => {
     process.env.HTTP_PROXY = 'http://proxy';
     process.env.HTTPS_PROXY = 'http://proxy';
+    process.env.RENOVATE_X_YARN_PROXY = 'true';
     GlobalConfig.set({
       localDir: '.',
       allowScripts: true,
diff --git a/lib/modules/manager/npm/post-update/yarn.ts b/lib/modules/manager/npm/post-update/yarn.ts
index fe4d57a3bab6a1df28d70b56029449f7c45699c7..3334a8d6167419c98acfbfd4d444bc6bf9bcaa2a 100644
--- a/lib/modules/manager/npm/post-update/yarn.ts
+++ b/lib/modules/manager/npm/post-update/yarn.ts
@@ -210,7 +210,7 @@ export async function generateLockFile(
       commands.push(`yarn set version ${quote(yarnUpdate.newValue!)}`);
     }
 
-    if (!process.env.RENOVATE_X_YARN_IGNORE_PROXY) {
+    if (process.env.RENOVATE_X_YARN_PROXY) {
       if (process.env.HTTP_PROXY && !isYarn1) {
         commands.push('yarn config unset --home httpProxy');
         commands.push(
diff --git a/lib/modules/manager/npm/readme.md b/lib/modules/manager/npm/readme.md
index aa0be6c827e67ab40e460a539aec0bef2a4199dc..a5d8549e57ab5f823eab9f5c530746a3c0c403c7 100644
--- a/lib/modules/manager/npm/readme.md
+++ b/lib/modules/manager/npm/readme.md
@@ -17,9 +17,10 @@ If Renovate detects a `packageManager` setting for Yarn in `package.json` then i
 #### HTTP Proxy Support
 
 Yarn itself does not natively recognize/support the `HTTP_PROXY` and `HTTPS_PROXY` environment variables.
-If Renovate detects Yarn 2+, and one or both of those variables are present, then it will run commands like `yarn config set --home httpProxy http://proxy` prior to executing `yarn install`.
+
+You can configure `RENOVATE_X_YARN_PROXY=true` as an environment variable to enable configuring of Yarn proxy (e.g. if you cannot configure these proxy settings yourself in `~/.yarnrc.yml`).
+
+If set, and Renovate detects Yarn 2+, and one or both of those variables are present, then Renovate will run commands like `yarn config set --home httpProxy http://proxy` prior to executing `yarn install`.
 This will result in the `~/.yarnrc.yml` file being created or modified with these settings, and the settings are not removed afterwards.
 
 Configuration/conversion of `NO_PROXY` to Yarn config is not supported.
-
-You can configure `RENOVATE_X_YARN_IGNORE_PROXY=true` as an environment variable to skip the configuring of Yarn proxy (e.g. if you already configure these proxy settings yourself in `~/.yarnrc.yml`);