diff --git a/common/Reflection.h b/common/Reflection.h
index 00b960dc..8b1ccb29 100644
--- a/common/Reflection.h
+++ b/common/Reflection.h
@@ -22,6 +22,7 @@ struct Reflection {
     float sigma;
     float dist_ewald;
     bool observed = false;
+    float partiality = 1.0;
 };
 
 #endif //JFJOCH_REFLECTION_H