diff --git a/src/app/calculators/parsimulation/en.json b/src/app/calculators/parsimulation/en.json
index 3ff2bc405e5f8df41113a61549a7230f0159b0b2..810c6e72e2f2e7214b0afdaf457043e4d342e7db 100644
--- a/src/app/calculators/parsimulation/en.json
+++ b/src/app/calculators/parsimulation/en.json
@@ -33,6 +33,7 @@
     "H": "Baffle height",
     "Hmin": "Hmin",
     "Hmax": "Hmax",
+    "DH": "Downstream pass fall",
 
     "select_par_type": "Type de passe",
     "select_par_type_0": "Plane baffles",
@@ -64,5 +65,6 @@
     "UNIT_ZD2": "m",
     "UNIT_ZR2": "m",
     "UNIT_LPI": "m",
-    "UNIT_LPH": "m"
+    "UNIT_LPH": "m",
+    "UNIT_DH": "m"
 }
diff --git a/src/app/calculators/parsimulation/fr.json b/src/app/calculators/parsimulation/fr.json
index 5748df1e62a2c027ac6137a48692c46db10ec95d..a5a4335d73fc1d0a7fe44b8f4f4f1acad3f9f698 100644
--- a/src/app/calculators/parsimulation/fr.json
+++ b/src/app/calculators/parsimulation/fr.json
@@ -33,6 +33,7 @@
     "H": "Hauteur d'un ralentisseur",
     "Hmin": "Hmin",
     "Hmax": "Hmax",
+    "DH": "Chute en pied de passe",
 
     "select_par_type": "Type de passe",
     "select_par_type_0": "Ralentisseurs plans",
@@ -64,5 +65,6 @@
     "UNIT_ZD2": "m",
     "UNIT_ZR2": "m",
     "UNIT_LPI": "m",
-    "UNIT_LPH": "m"
+    "UNIT_LPH": "m",
+    "UNIT_DH": "m"
 }