diff --git a/src/main/java/bdv/server/CellHandler.java b/src/main/java/bdv/server/CellHandler.java
index 4b09666b33e8787ccd54900ec472b4a4b96bf753..0f363d7a3a1ff36f940113360083397fc619c751 100644
--- a/src/main/java/bdv/server/CellHandler.java
+++ b/src/main/java/bdv/server/CellHandler.java
@@ -505,7 +505,9 @@ public class CellHandler extends ContextHandler {
             for (final ICacheFile cacheFile : cachedCodebooks) {
                 cacheFile.writeToStream(dos);
             }
+            LOG.info(String.format("init_qcmp responding with %d bytes", dos.size()));
         } // Stream gets closed here.
+
         response.setContentType("application/octet-stream");
         response.setStatus(HttpServletResponse.SC_OK);
         baseRequest.setHandled(true);