diff --git a/lib/manager/npm/extract/index.js b/lib/manager/npm/extract/index.js
index 3da53a99edaca50fdde05b48d6794b4abf7075b2..feef03397d9cb4fcf4bd03b56d041c0226dc8fe8 100644
--- a/lib/manager/npm/extract/index.js
+++ b/lib/manager/npm/extract/index.js
@@ -58,6 +58,9 @@ async function extractPackageFile(content, fileName, config) {
     throw error;
   }
   const packageJsonName = packageJson.name;
+  logger.debug(
+    `npm file ${fileName} has name ${JSON.stringify(packageJsonName)}`
+  );
   const packageJsonVersion = packageJson.version;
   let yarnWorkspacesPackages;
   if (packageJson.workspaces && packageJson.workspaces.packages) {