diff --git a/acstools/utils_findsat_mrt.py b/acstools/utils_findsat_mrt.py
index cdaa87a..51637cd 100644
--- a/acstools/utils_findsat_mrt.py
+++ b/acstools/utils_findsat_mrt.py
@@ -20,8 +20,8 @@
     from skimage import transform
     from skimage.transform._warps import warp
     from skimage._shared.utils import convert_to_float
-except ImportError:
-    warnings.warn('skimage not installed. MRT calculation will not work.')
+except ImportError as e:
+    warnings.warn(f'skimage not installed. MRT calculation will not work: {repr(e)}')
 
 # check for scipy
 try: