1 files changed, 1 insertions, 0 deletions
diff --git a/param.ccl b/param.ccl
index 14f9294..0c596d2 100644
--- a/param.ccl
+++ b/param.ccl
@@ -6,6 +6,7 @@ private:
 KEYWORD bound "Type of boundary condition to use"
 {
   "none"      :: "No boundary condition"
+  "zero"      :: "Set boundary to zero"
   "flat"      :: "Flat boundary condition"
   "radiation" :: "Radiation boundary condition"
 } "none"