diff --git a/src/too/__main__.py b/src/too/__main__.py
index 54c7c39..d16bb74 100644
--- a/src/too/__main__.py
+++ b/src/too/__main__.py
@@ -166,6 +166,9 @@ def process(
             validate_magnitude_limits=True,
         )
 
+    else:
+        log.warning("No new files to process.")
+
     if cross_match:
         log.info("Cross-matching targets.")
         xmatch_too_targets(database)