diff --git a/src/include/Configuration.h b/src/include/Configuration.h
index c4605423d251488cd3f9cc12fb2f23cf2008df4e..fdc36184be5f58f321b221b8752113d210583349 100644
--- a/src/include/Configuration.h
+++ b/src/include/Configuration.h
@@ -199,7 +199,7 @@ protected:
 	int number_of_scales;
 	//! \brief Type of dielectric functions (<0 at XIP, =0 as function of XI, >0 contants).
 	int idfc;
-	//! \brief EXDC. QUESTION: better definition?
+	//! \brief External medium dielectric constant. QUESTION: correct?
 	double exdc;
 	//! \brief WP. QUESTION: better definition?
 	double wp;