diff --git a/lib/set-npmrc-auth.js b/lib/set-npmrc-auth.js
index 596f1826..821632ca 100644
--- a/lib/set-npmrc-auth.js
+++ b/lib/set-npmrc-auth.js
@@ -17,6 +17,11 @@ module.exports = async (
     {registry: 'https://registry.npmjs.org/'},
     {config: NPM_CONFIG_USERCONFIG || path.resolve(cwd, '.npmrc')}
   );
+
+  if (configs) {
+    logger.log('Reading npm config from %s', configs.join(', '));
+  }
+
   const currentConfig = configs ? (await Promise.all(configs.map(config => readFile(config)))).join('\n') : '';
 
   if (getAuthToken(registry, {npmrc: rcConfig})) {
diff --git a/test/set-npmrc-auth.test.js b/test/set-npmrc-auth.test.js
index 7178e54f..3d79ef03 100644
--- a/test/set-npmrc-auth.test.js
+++ b/test/set-npmrc-auth.test.js
@@ -60,7 +60,11 @@ test.serial('Preserve home ".npmrc"', async t => {
   await require('../lib/set-npmrc-auth')(npmrc, 'http://custom.registry.com', {cwd, env, logger: t.context.logger});
 
   t.is((await readFile(npmrc)).toString(), `home_config = test\n//custom.registry.com/:_authToken = \${NPM_TOKEN}`);
-  t.deepEqual(t.context.log.args[1], [`Wrote NPM_TOKEN to ${npmrc}`]);
+  t.deepEqual(t.context.log.args[1], [
+    'Reading npm config from %s',
+    [path.resolve(process.env.HOME, '.npmrc')].join(', '),
+  ]);
+  t.deepEqual(t.context.log.args[2], [`Wrote NPM_TOKEN to ${npmrc}`]);
 });
 
 test.serial('Preserve home and local ".npmrc"', async t => {
@@ -79,7 +83,11 @@ test.serial('Preserve home and local ".npmrc"', async t => {
     (await readFile(npmrc)).toString(),
     `home_config = test\ncwd_config = test\n//custom.registry.com/:_authToken = \${NPM_TOKEN}`
   );
-  t.deepEqual(t.context.log.args[1], [`Wrote NPM_TOKEN to ${npmrc}`]);
+  t.deepEqual(t.context.log.args[1], [
+    'Reading npm config from %s',
+    [path.resolve(process.env.HOME, '.npmrc'), path.resolve(cwd, '.npmrc')].join(', '),
+  ]);
+  t.deepEqual(t.context.log.args[2], [`Wrote NPM_TOKEN to ${npmrc}`]);
 });
 
 test.serial('Preserve all ".npmrc" if auth is already configured', async t => {
@@ -94,7 +102,10 @@ test.serial('Preserve all ".npmrc" if auth is already configured', async t => {
   await require('../lib/set-npmrc-auth')(npmrc, 'http://custom.registry.com', {cwd, env: {}, logger: t.context.logger});
 
   t.is((await readFile(npmrc)).toString(), `home_config = test\n//custom.registry.com/:_authToken = \${NPM_TOKEN}`);
-  t.is(t.context.log.callCount, 1);
+  t.deepEqual(t.context.log.args[1], [
+    'Reading npm config from %s',
+    [path.resolve(process.env.HOME, '.npmrc'), path.resolve(cwd, '.npmrc')].join(', '),
+  ]);
 });
 
 test.serial('Preserve ".npmrc" if auth is already configured for a scoped package', async t => {
@@ -115,7 +126,10 @@ test.serial('Preserve ".npmrc" if auth is already configured for a scoped packag
     (await readFile(npmrc)).toString(),
     `home_config = test\n@scope:registry=http://custom.registry.com\n//custom.registry.com/:_authToken = \${NPM_TOKEN}`
   );
-  t.is(t.context.log.callCount, 1);
+  t.deepEqual(t.context.log.args[1], [
+    'Reading npm config from %s',
+    [path.resolve(process.env.HOME, '.npmrc'), path.resolve(cwd, '.npmrc')].join(', '),
+  ]);
 });
 
 test.serial('Throw error if "NPM_TOKEN" is missing', async t => {
@@ -148,7 +162,7 @@ test.serial('Emulate npm config resolution if "NPM_CONFIG_USERCONFIG" is set', a
   });
 
   t.is((await readFile(npmrc)).toString(), `//custom.registry.com/:_authToken = \${NPM_TOKEN}`);
-  t.is(t.context.log.callCount, 1);
+  t.deepEqual(t.context.log.args[1], ['Reading npm config from %s', [path.resolve(cwd, '.custom-npmrc')].join(', ')]);
 });
 
 test.serial('Throw error if "NPM_USERNAME" is missing', async t => {