diff --git a/pvnet_app/data/satellite.py b/pvnet_app/data/satellite.py
index 52b7e08..e3cd6c6 100644
--- a/pvnet_app/data/satellite.py
+++ b/pvnet_app/data/satellite.py
@@ -359,7 +359,7 @@ def check_for_constant_values(value: Optional[float] = 0, threshold: Optional[fl
     Note that in the UK, even at night, the values are not zero.
     """
     # check satellite for zeros
-    logger.info("Checking satellite data for constant value ({value})")
+    logger.info(f"Checking satellite data for constant value ({value})")
     ds_sat = xr.open_zarr(sat_path)
     shape = ds_sat.data.shape
     n_data_points_per_timestep = shape[1] * shape[2] * shape[3]
diff --git a/tests/data/test_satellite.py b/tests/data/test_satellite.py
index e12a2e9..14d0ceb 100644
--- a/tests/data/test_satellite.py
+++ b/tests/data/test_satellite.py
@@ -265,7 +265,7 @@ def test_zeros_in_sat_data(sat_15_data_small, test_t0):
 
 
 def test_remove_satellite_data(sat_15_data_small, test_t0):
-    """Check error is made if data has zeros"""
+    """Check error is made if data has nans"""
     # make temporary directory
     with tempfile.TemporaryDirectory() as tmpdirname:
         # Change to temporary working directory