diff --git a/potentials/BN.extep b/potentials/BN.extep
index 1b9f46c7681077d1422d175010318a73aeafdb35..8732ada84bf95dc6814d0ef839b18b686a4e914d 100644
--- a/potentials/BN.extep
+++ b/potentials/BN.extep
@@ -107,8 +107,3 @@ N   B   N   3  1.0   0.0d0  306.586555205d0  10.d0  -0.7218d0  0.6576543657d0  0
   N   N     4    2    0.0060   -0.0073    0.0000    0.0000
   N   N     4    3    0.0000    0.0000    0.0000    0.0000
   N   N     4    4    0.0000    0.0000    0.0000    0.0000
-
-#  Elastic properties
-#  ==================
-# hBN: B=164 N/M; C11=290 N/M; kappa=0.64 eV
-# cBN: B=402 GPa; C11=567 GPa; C66=533 GPa