diff --git a/src/main/java/hudson/remoting/JarLoaderImpl.java b/src/main/java/hudson/remoting/JarLoaderImpl.java
index f1fc0c866..4a6a610bc 100644
--- a/src/main/java/hudson/remoting/JarLoaderImpl.java
+++ b/src/main/java/hudson/remoting/JarLoaderImpl.java
@@ -46,6 +46,7 @@ public void writeJarTo(long sum1, long sum2, OutputStream sink) throws IOExcepti
         if (channel != null) {
             if (url.getProtocol().equals("file")) {
                 try {
+                    LOGGER.log(Level.FINE, () -> "sending " + url + " to " + channel.getName());
                     channel.notifyJar(new File(url.toURI()));
                 } catch (URISyntaxException | IllegalArgumentException x) {
                     LOGGER.log(Level.WARNING, x, () -> "cannot properly report " + url);