diff --git a/src/generic/Group.cpp b/src/generic/Group.cpp
index 0c1c4a1be40b9f21c3f9e41325e1d11c6fbc29bf..a86b81b91c6c2a24d72b90733d8fcc182d1521c8 100644
--- a/src/generic/Group.cpp
+++ b/src/generic/Group.cpp
@@ -63,7 +63,7 @@ h: GROUP ATOMS=2,3,5,6,8,9,12,13
 \endverbatim
 and then include it in the main 'plumed.dat' file
 \verbatim
-INCLUDE groups.dat
+INCLUDE FILE=groups.dat
 # compute the coordination among the two groups
 c: COORDINATION GROUPA=o GROUPB=h R_0=0.3
 # print the coordination on file 'colvar'