diff --git a/csst_mci_sim/csst_mci_sim.py b/csst_mci_sim/csst_mci_sim.py
index 54bc11e31e57b16b8a1403a37e113a504ca0d029..22365ec42a0ac3171d4ccc4403b78219070b4671 100644
--- a/csst_mci_sim/csst_mci_sim.py
+++ b/csst_mci_sim/csst_mci_sim.py
@@ -2088,6 +2088,8 @@ class MCIsimulator():
                 
                 cx0,cy0=centroid(stamp_img.array)
                 
+                self.log.info('appfat= %s'%(self.appFatt))
+                
                 if self.appFatt : 
                     self.log.info('begin appfat ........')