diff --git a/src/app/calculators/par/en.json b/src/app/calculators/par/en.json
index 112496a3e201f6c620d7d7015c62003b9acece98..6274ab345545319ce0ad2d975e7a36db685e3ba2 100644
--- a/src/app/calculators/par/en.json
+++ b/src/app/calculators/par/en.json
@@ -10,8 +10,8 @@
     "ZD1": "Upstream spilling elevation",
     "S": "Slope",
     "P": "Space between baffles",
-    "L": "Pass width",
-    "a": "Baffle / chevron height",
+    "L": "Total width of baffle / pattern (superactive)",
+    "a": "Height of the pattern / height and thickness of the chevron (chevrons)",
     "N": "Number of patterns",
     "M": "Number of longitudinal strips",
 
@@ -27,12 +27,12 @@
     "LPI": "Pass length following the slope",
     "LPH": "Pass length in horizontal projection",
     "A": "A",
-    "B": "B",
-    "C": "C",
-    "D": "D",
+    "B": "Internal width of the baffle / channel (chevrons)",
+    "C": "Height from the base of the baffle to the base of the triangle",
+    "D": "Height from the base of the baffle to its tipping point",
     "H": "Baffle height",
-    "Hmin": "Hmin",
-    "Hmax": "Hmax",
+    "Hmin": "Minimal baffle height",
+    "Hmax": "Maximal baffle height",
 
     "select_par_type": "Type de passe",
     "select_par_type_0": "Plane baffles",
diff --git a/src/app/calculators/par/fr.json b/src/app/calculators/par/fr.json
index 2fc234d8496fbfa9e3b364c9d0e963fcb88f6faf..027b8097a3599b1fa0e67f4a60b2453a2566d097 100644
--- a/src/app/calculators/par/fr.json
+++ b/src/app/calculators/par/fr.json
@@ -10,8 +10,8 @@
     "ZD1": "Cote de déversement à l'amont",
     "S": "Pente",
     "P": "Espacement entre les ralentisseurs",
-    "L": "Largeur de la passe",
-    "a": "Hauteur des ralentisseurs / des chevrons",
+    "L": "Largeur totale du ralentisseur  / du motif (suractifs)",
+    "a": "Hauteur du motif / hauteur et épaisseur du chevron (chevrons)",
     "N": "Nombre de motifs",
     "M": "Nombre de bandes longitudinales",
 
@@ -27,12 +27,12 @@
     "LPI": "Longueur de la passe en suivant la pente",
     "LPH": "Longueur de la passe en projection horizontale",
     "A": "A",
-    "B": "B",
-    "C": "C",
-    "D": "D",
-    "H": "Hauteur d'un ralentisseur",
-    "Hmin": "Hmin",
-    "Hmax": "Hmax",
+    "B": "Largeur interne du ralentisseur / du chenal (chevrons)",
+    "C": "Hauteur de la base du ralentisseur jusqu’à la base du triangle",
+    "D": "Hauteur de la base du ralentisseur jusqu’à sa pointe déversante",
+    "H": "Hauteur du ralentisseur",
+    "Hmin": "Hauteur minimale du ralentisseur",
+    "Hmax": "Hauteur maximale du ralentisseur",
 
     "select_par_type": "Type de passe",
     "select_par_type_0": "Ralentisseurs plans",
diff --git a/src/app/calculators/parsimulation/en.json b/src/app/calculators/parsimulation/en.json
index 3ff2bc405e5f8df41113a61549a7230f0159b0b2..1872b2949eed2712c4b8c175a05d535498b1f4d7 100644
--- a/src/app/calculators/parsimulation/en.json
+++ b/src/app/calculators/parsimulation/en.json
@@ -14,8 +14,8 @@
     "S": "Slope",
     "P": "Space between baffles",
     "Nb": "Number of baffles",
-    "L": "Pass width",
-    "a": "Baffle / chevron height",
+    "L": "Total width of baffle / pattern (superactive)",
+    "a": "Height of the pattern / height and thickness of the chevron (chevrons)",
     "N": "Number of patterns",
     "M": "Number of longitudinal strips",
 
@@ -27,12 +27,12 @@
     "LPI": "Pass length following the slope",
     "LPH": "Pass length in horizontal projection",
     "A": "A",
-    "B": "B",
-    "C": "C",
-    "D": "D",
+    "B": "Internal width of the baffle / channel (chevrons)",
+    "C": "Height from the base of the baffle to the base of the triangle",
+    "D": "Height from the base of the baffle to its tipping point",
     "H": "Baffle height",
-    "Hmin": "Hmin",
-    "Hmax": "Hmax",
+    "Hmin": "Minimal baffle height",
+    "Hmax": "Maximal baffle height",
 
     "select_par_type": "Type de passe",
     "select_par_type_0": "Plane baffles",
diff --git a/src/app/calculators/parsimulation/fr.json b/src/app/calculators/parsimulation/fr.json
index 5748df1e62a2c027ac6137a48692c46db10ec95d..0b6c772b63a09529d30069c8d352ea3f01ed8919 100644
--- a/src/app/calculators/parsimulation/fr.json
+++ b/src/app/calculators/parsimulation/fr.json
@@ -14,8 +14,8 @@
     "S": "Pente",
     "P": "Espacement entre les ralentisseurs",
     "Nb": "Nombre de ralentisseurs",
-    "L": "Largeur de la passe",
-    "a": "Hauteur des ralentisseurs / des chevrons",
+    "L": "Largeur totale du ralentisseur  / du motif (suractifs)",
+    "a": "Hauteur du motif / hauteur et épaisseur du chevron (chevrons)",
     "N": "Nombre de motifs",
     "M": "Nombre de bandes longitudinales",
 
@@ -27,12 +27,12 @@
     "LPI": "Longueur de la passe en suivant la pente",
     "LPH": "Longueur de la passe en projection horizontale",
     "A": "A",
-    "B": "B",
-    "C": "C",
-    "D": "D",
-    "H": "Hauteur d'un ralentisseur",
-    "Hmin": "Hmin",
-    "Hmax": "Hmax",
+    "B": "Largeur interne du ralentisseur / du chenal (chevrons)",
+    "C": "Hauteur de la base du ralentisseur jusqu’à la base du triangle",
+    "D": "Hauteur de la base du ralentisseur jusqu’à sa pointe déversante",
+    "H": "Hauteur du ralentisseur",
+    "Hmin": "Hauteur minimale du ralentisseur",
+    "Hmax": "Hauteur maximale du ralentisseur",
 
     "select_par_type": "Type de passe",
     "select_par_type_0": "Ralentisseurs plans",
diff --git a/src/locale/messages.en.json b/src/locale/messages.en.json
index d951b42c120ba3c3c2dd192e08234ab2f5000086..5b27a9971b0ea199d3e26bcffdf65b26e6a53cee 100644
--- a/src/locale/messages.en.json
+++ b/src/locale/messages.en.json
@@ -545,8 +545,8 @@
     "WARNING_SESSION_LOAD_NOTES_MERGED": "Notes have been merged",
     "WARNING_VALUE_ROUNDED_TO_INTEGER": "Value of %symbol% was rounded to %rounded%",
     "WARNING_VARIATED_LENGTH_LIMITED_BY_LINKED_RESULT": "Number of results is limited by linked result %symbol%",
-    "WARNING_PAR_P_WAS_IGNORED": "Given P value was ignored",
-    "ERROR_PAR_P_DEVIATES_MORE_THAN_10_5_PCT": "Given P value is more than 10% lower or more than 5% greater than standard value %stdP%",
+    "WARNING_PAR_P_WAS_IGNORED": "Given spacing value was ignored",
+    "ERROR_PAR_P_DEVIATES_MORE_THAN_10_5_PCT": "Given spacing value is more than 10% lower or more than 5% greater than standard value %stdP%",
     "ERROR_PAR_QSTAR_OUT_OF_RANGE": "qStar value %val% is outside of validity interval [ %min%, %max% ] given by abacuses",
     "ERROR_PAR_HA_OUT_OF_RANGE": "ha value %val% is outside of validity interval [ %min%, %max% ] given by abacuses",
     "WARNING_PAR_L": "A witdh greater than %max% is discouraged",
diff --git a/src/locale/messages.fr.json b/src/locale/messages.fr.json
index 00c6d54d8cf3a1f2231757fa9221465cf6e671a8..e1cd5c8334487b70d8f2537d6328468ff968340f 100644
--- a/src/locale/messages.fr.json
+++ b/src/locale/messages.fr.json
@@ -546,8 +546,8 @@
     "WARNING_SESSION_LOAD_NOTES_MERGED": "Les notes ont été fusionnées",
     "WARNING_VALUE_ROUNDED_TO_INTEGER": "La valeur de %symbol% a été arrondie à %rounded%",
     "WARNING_VARIATED_LENGTH_LIMITED_BY_LINKED_RESULT": "Le nombre de résultats est limité par le résultat lié %symbol%",
-    "WARNING_PAR_P_WAS_IGNORED": "La valeur de P fournie a été ignorée",
-    "ERROR_PAR_P_DEVIATES_MORE_THAN_10_5_PCT": "La valeur de P fournie est plus de 10% plus petite ou plus de 5% plus grande que la valeur standard %stdP%",
+    "WARNING_PAR_P_WAS_IGNORED": "La valeur d'espacement fournie a été ignorée",
+    "ERROR_PAR_P_DEVIATES_MORE_THAN_10_5_PCT": "La valeur d'espacement fournie est plus de 10% plus petite ou plus de 5% plus grande que la valeur standard %stdP%",
     "ERROR_PAR_QSTAR_OUT_OF_RANGE": "La valeur %val% de qStar sort de l'intervalle de validité [ %min%, %max% ] donné par les abaques",
     "ERROR_PAR_HA_OUT_OF_RANGE": "La valeur %val% de ha sort de l'intervalle de validité [ %min%, %max% ] donné par les abaques",
     "WARNING_PAR_L": "Une largeur supérieure à %max% est déconseillée",