diff --git a/src/fof.c b/src/fof.c
index a40635620dbcf22e8ccb19971907e57a63964640..8df0c168709cd1fc1d8fb0ea2f65f84c9a170751 100644
--- a/src/fof.c
+++ b/src/fof.c
@@ -2165,6 +2165,7 @@ void fof_search_foreign_cells(struct fof_props *props, const struct space *s) {
         "took: %.3f %s.",
         clocks_from_ticks(getticks() - tic), clocks_getunit());
 
+  /* Activate the tasks exchanging all the required gparts */
   engine_activate_gpart_comms(e);
 
   ticks local_fof_tic = getticks();