diff --git a/Inst_eddies/set_max_speed.f90 b/Inst_eddies/set_max_speed.f90
index 263d0e3b30c97715e73cfb2adf9e1b05df9397bf..29c4047bf47e5c38fe163e0419616f67ceb02713 100644
--- a/Inst_eddies/set_max_speed.f90
+++ b/Inst_eddies/set_max_speed.f90
@@ -43,9 +43,10 @@ contains
     ! speed on speed_cont.
 
     type(ssh_contour), intent(inout):: cont_list(:) ! (n_max_cont)
-    ! Contour list. Defined only for subscripts 1:n_cont. On entry,
-    ! the outermost contour is element with subscript n_cont. The
-    ! contours between 1 and i_outer are in monotonic order of
+    ! Contour list, with points given by longitude and latitude, in
+    ! radians. Defined only for subscripts 1:n_cont. On entry, the
+    ! outermost contour is element with subscript n_cont. The contours
+    ! between 1 and i_outer are in monotonic order of
     ! ssh. cont_list%area has its default initialization value and the
     ! order of points in the polyline components (clockwise or
     ! counter-clockwise) is not specified.