diff --git a/lib/manager/npm/post-update/npm.js b/lib/manager/npm/post-update/npm.js
index c9e11dc06703e416435510ca9ff19da5c6ccc6d0..4469042a4ddf6771b3b1ef3c26ec648bc56100bf 100644
--- a/lib/manager/npm/post-update/npm.js
+++ b/lib/manager/npm/post-update/npm.js
@@ -79,6 +79,7 @@ async function generateLockFile(
     logger.debug(`npm stderr:\n${stderr}`);
     const lockUpdates = upgrades.filter(upgrade => upgrade.isLockfileUpdate);
     if (lockUpdates.length) {
+      logger.info('Performing lockfileUpdate (npm)');
       const updateCmd =
         cmd +
         lockUpdates
diff --git a/lib/manager/npm/post-update/yarn.js b/lib/manager/npm/post-update/yarn.js
index 2fc57c6501039892cf9a5fba65f4f6eede0c6fa1..c8c980592ae9067f27f2835d85308321457360d9 100644
--- a/lib/manager/npm/post-update/yarn.js
+++ b/lib/manager/npm/post-update/yarn.js
@@ -93,6 +93,7 @@ async function generateLockFile(cwd, env, config = {}, upgrades = []) {
       .filter(upgrade => upgrade.isLockfileUpdate)
       .map(upgrade => upgrade.depName);
     if (lockUpdates.length) {
+      logger.info('Performing lockfileUpdate (yarn)');
       const updateCmd =
         cmd +
         ' upgrade' +