diff --git a/src/USER-MISC/pair_kolmogorov_crespi_z.cpp b/src/USER-MISC/pair_kolmogorov_crespi_z.cpp
index 04641621f759e68a9015e27d22b25fac200f54b3..d161fe09c846b604652eff8130f83109d022606d 100644
--- a/src/USER-MISC/pair_kolmogorov_crespi_z.cpp
+++ b/src/USER-MISC/pair_kolmogorov_crespi_z.cpp
@@ -13,6 +13,7 @@
 
 /* ----------------------------------------------------------------------
    Contributing author: Jaap Kroes (Radboud Universiteit)
+   e-mail: jaapkroes at gmail dot com
    based on previous versions by Merel van Wijk and by Marco Raguzzoni
   
    This is a simplified version of the potential described in