1 files changed, 9 insertions, 7 deletions
diff --git a/param.ccl b/param.ccl
index df61516..415358c 100644
--- a/param.ccl
+++ b/param.ccl
@@ -30,13 +30,8 @@ private:
 # ***** overall parameters *****
 #
 
-boolean find_AHs_at_postinitial \
-  "should we try to find apparent horizons at CCTK_POSTINITIAL?"
-{
-} "true"
-
-boolean find_AHs_at_poststep \
-  "should we try to find apparent horizons at CCTK_POSTSTEP?"
+# set this to (try to) find apparent horizons at every time step
+boolean find_AHs "should we try to find apparent horizons?"
 {
 } "true"
 
@@ -951,6 +946,13 @@ string geometry_interpolator_name \
 .+ :: "any string"
 } "Hermite polynomial interpolation"
 
+#
+# The defaults here are set up for 3rd order Hermite interpolation,
+# which requires driver::ghost_size >= 3.  If you want to run with
+# driver::ghost_size == 2, you need to lower the interpolation order
+# to 2; see  par/misner-ghost2-mask-noshrink.par  for an example of
+# how to do this.
+#
 string geometry_interpolator_pars \
   "parameters for the geometry interpolator"
 {