diff --git a/plugins/Perturbation/EZFIO.cfg b/plugins/Perturbation/EZFIO.cfg
index 0477e87b..19c6c52d 100644
--- a/plugins/Perturbation/EZFIO.cfg
+++ b/plugins/Perturbation/EZFIO.cfg
@@ -21,8 +21,7 @@ default: 0.75
 [correlation_energy_ratio_max]
 type: Normalized_float
 doc: The selection process stops at a fixed correlation ratio (usefull for getting same accuracy between molecules)
-     Defined as (E_CI-E_HF)/ (E_CI+PT2 - E_HF)
-     If Ratio==1 it will not be used. (E_HF) is not required. 
+     Defined as (E_CI-E_HF)/ (E_CI+PT2 - E_HF)  If Ratio eq 1 it will not be used. (E_HF) is not required. 
 interface: ezfio,provider,ocaml
 default: 1.00