diff --git a/src/colvar/ERMSD.cpp b/src/colvar/ERMSD.cpp
index 353505cfa757b3dab596b5a9980b237dd69d68d0..aad59f6154cbf217324438c64bfee733fb7e614b 100644
--- a/src/colvar/ERMSD.cpp
+++ b/src/colvar/ERMSD.cpp
@@ -19,6 +19,12 @@
    You should have received a copy of the GNU Lesser General Public License
    along with plumed.  If not, see <http://www.gnu.org/licenses/>.
 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
+
+/*
+ This vast majority of the source code in this file was writting by
+ Sandro Bottaro with some help from Giovanni Bussi
+*/
+
 #include "Colvar.h"
 #include "core/PlumedMain.h"
 #include "ActionRegister.h"
diff --git a/src/tools/ERMSD.cpp b/src/tools/ERMSD.cpp
index e0ec57a70a9c21316c65fa85a08d997e6c535bd6..6e41d3a1af7c2d98469c7569b9b62e40a4fdfb53 100644
--- a/src/tools/ERMSD.cpp
+++ b/src/tools/ERMSD.cpp
@@ -19,6 +19,12 @@
    You should have received a copy of the GNU Lesser General Public License
    along with plumed.  If not, see <http://www.gnu.org/licenses/>.
 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
+
+/*
+ This vast majority of the source code in this file was writting by
+ Sandro Bottaro with some help from Giovanni Bussi
+*/
+
 #include "ERMSD.h"
 #include "PDB.h"
 #include "Matrix.h"