diff --git a/code/config/Phase_Phenopowerlaw_Gold.config b/code/config/Phase_Phenopowerlaw_Gold.config
index 69221a795..a2cecade8 100644
--- a/code/config/Phase_Phenopowerlaw_Gold.config
+++ b/code/config/Phase_Phenopowerlaw_Gold.config
@@ -1,5 +1,12 @@
 ### $Id$ ###
 
+
+# parameters fitted by D. Ma to:
+# I. Kovács, G. Vörös
+# On the mathematical description of the tensile stress-strain curves of polycrystalline face centered cubic metals
+# International Journal of Plasticity, Volume 12, Issue 1, 1996, Pages 35–43
+# DOI: 10.1016/S0749-6419(95)00043-7
+
 [gold_phenopowerlaw]
 # slip only
 elasticity              hooke