diff --git a/satcal.h b/satcal.h
index 43d0349..87def06 100644
--- a/satcal.h
+++ b/satcal.h
@@ -32,6 +32,7 @@
 { /*  nonlinear radiance correction Ns,b0,b1,b2 */
 {-8.55 , 8.22 , -0.15795 , 0.00075579}, /* channel 4 */
 {-3.97 , 4.31 , -0.07318 , 0.00030976}, /* channel 5 */
+{0.0,0.0,0.0,0.0}  /* channel 3B*/
 }
 }
 };