diff --git a/caveclient/skeletonservice.py b/caveclient/skeletonservice.py
index acac61f..3de0d4a 100644
--- a/caveclient/skeletonservice.py
+++ b/caveclient/skeletonservice.py
@@ -15,6 +15,10 @@
 
     CLOUDVOLUME_AVAILABLE = True
 except ImportError:
+    logging.warning(
+        "cloudvolume not installed. Some output formats will not be available."
+    )
+
     CLOUDVOLUME_AVAILABLE = False
 
 from .auth import AuthClient