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-rw-r--r--doc/documentation.tex4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/documentation.tex b/doc/documentation.tex
index 18d41ea..e27881f 100644
--- a/doc/documentation.tex
+++ b/doc/documentation.tex
@@ -269,7 +269,9 @@ the list of all selected grid variables, and calls the registered
function corresponding to the requested boundary condition on each.
\texttt{Boundary\_ClearSelection} clears the list of selected grid
variables. A thorn which wishes to have boundary conditions applied
-simply schedules \texttt{ApplyBCs} at the appropriate point.
+simply schedules \texttt{ApplyBCs} at the appropriate point. Please
+schedule it as e.g.~\verb|<MyThorn>_ApplyBCs|, to make each instance
+of it unique.
\texttt{Boundary\_ClearSelection} ensures that each boundary condition
gets executed exactly once for each selected grid variable.