diff --git a/src/app/calculators/verificateur/config.json b/src/app/calculators/verificateur/config.json
index ad7798eaa3249f38eb6f2a982fd813ce5a04ee82..438d2bf32cc332050660af1651db011636be0891 100644
--- a/src/app/calculators/verificateur/config.json
+++ b/src/app/calculators/verificateur/config.json
@@ -6,7 +6,8 @@
             {
                 "id": "select_target_pass",
                 "type": "select_custom",
-                "source": "verificateur_target"
+                "source": "verificateur_target",
+                "messageWhenEmpty": "INFO_VERIF_CREATE_PASS_FRIST"
             }
         ]
     },
diff --git a/src/app/components/generic-select/generic-select.component.html b/src/app/components/generic-select/generic-select.component.html
index 5dcaf95e7f8ff6c617cd2d2792c395720602f020..9c6880e13e8913f9b7ff1d8073d4df4f5df4ddd0 100644
--- a/src/app/components/generic-select/generic-select.component.html
+++ b/src/app/components/generic-select/generic-select.component.html
@@ -20,4 +20,7 @@
             help
         </mat-icon>
     </div>
-</mat-form-field>
\ No newline at end of file
+</mat-form-field>
+<div *ngIf="messageWhenEmpty" class="message-when-empty">
+    {{ messageWhenEmpty }}
+</div>
\ No newline at end of file
diff --git a/src/app/components/select-field-line/select-field-line.component.scss b/src/app/components/select-field-line/select-field-line.component.scss
index 2bd3e276513fd91a95e1933a69abe14f054c4fe8..92327696435c625fdda147240428e1e5ede6d298 100644
--- a/src/app/components/select-field-line/select-field-line.component.scss
+++ b/src/app/components/select-field-line/select-field-line.component.scss
@@ -13,3 +13,8 @@ mat-form-field {
         }
     }
 }
+
+.message-when-empty {
+    color: #af1280; // like mat-error
+    font-weight: 500;
+}
diff --git a/src/app/components/select-field-line/select-field-line.component.ts b/src/app/components/select-field-line/select-field-line.component.ts
index b438c0256a1cbb02c0ae95cdf675dff11bd4cc71..eccc37a991e5cdb7462c7f1ec2caddcb3c2ddb5e 100644
--- a/src/app/components/select-field-line/select-field-line.component.ts
+++ b/src/app/components/select-field-line/select-field-line.component.ts
@@ -46,6 +46,10 @@ export class SelectFieldLineComponent implements OnInit {
         return this._select.entries;
     }
 
+    public get messageWhenEmpty(): string {
+        return this._select.messageWhenEmpty;
+    }
+
     protected entryLabel(entry: SelectEntry): string {
         return decodeHtml(entry.label);
     }
diff --git a/src/app/formulaire/elements/select-field.ts b/src/app/formulaire/elements/select-field.ts
index 0884f25641cb3a37472be53baa6f0d928a7453fe..d003d2a6d36f30d495dd7de200e4c1e0b0a96fae 100644
--- a/src/app/formulaire/elements/select-field.ts
+++ b/src/app/formulaire/elements/select-field.ts
@@ -35,9 +35,15 @@ export class SelectField extends Field {
     /** if true, select box is grayed out */
     public disabled = false;
 
-    /** soruce identifier for populating with available values */
+    /** source identifier for populating with available values */
     protected source: string;
 
+    /**
+     * message to display below the select field when no option is selected,
+     * if this message is defined and not empty
+     */
+    protected _messageWhenEmpty: string;
+
     constructor(parent: FormulaireNode) {
         super(parent);
         this.clearEntries();
@@ -63,6 +69,14 @@ export class SelectField extends Field {
         return this._multiple;
     }
 
+    public get messageWhenEmpty(): string {
+        let msg: string;
+        if (this._selectedEntry === undefined && this._messageWhenEmpty) {
+            msg = ServiceFactory.i18nService.localizeText(this._messageWhenEmpty);
+        }
+        return msg;
+    }
+
     public clearEntries() {
         this._entries = [];
     }
@@ -145,6 +159,7 @@ export class SelectField extends Field {
         this._helpLink = field["help"];
         this._associatedProperty = field["property"];
         this._defaultValue = field["default"];
+        this._messageWhenEmpty = field["messageWhenEmpty"];
         if (field["multiple"] !== undefined) {
             this._multiple = field["multiple"];
         }
diff --git a/src/locale/messages.en.json b/src/locale/messages.en.json
index acbc4c1501bac560a985122e6d8a3223e51bb0e3..d65e11830a6bee55b56b3874e4f75bf6e7d0e69f 100644
--- a/src/locale/messages.en.json
+++ b/src/locale/messages.en.json
@@ -606,6 +606,7 @@
     "INFO_TRIGO_TITRE": "Trigonometric function",
     "INFO_TRIGO_DESCRIPTION": "cosinus sinus tangent arc",
     "INFO_TRIGO_TITRE_COURT": "Trigo. f.",
+    "INFO_VERIF_CREATE_PASS_FRIST": "Create first a fish ladder, a baffle fishway or a rock-ramp fishpass",
     "INFO_VERIF_OK": "Crossing criteria are met for all species",
     "INFO_VERIF_VARYING_OK": "Crossing criteria are met for all species and all pass modalities",
     "WARNING_VERIF_OK_BUT": "Crossing criteria are met for all species, but there are warnings",
diff --git a/src/locale/messages.fr.json b/src/locale/messages.fr.json
index 2fe2697aaa909d0f891524bba0fede5a4fbe4684..6804b1975c2f457efe07baba54274fb0bf3be14c 100644
--- a/src/locale/messages.fr.json
+++ b/src/locale/messages.fr.json
@@ -607,6 +607,7 @@
     "INFO_TRIGO_TITRE": "Fonction trigonométrique",
     "INFO_TRIGO_DESCRIPTION": "cosinus sinus tangente arc",
     "INFO_TRIGO_TITRE_COURT": "F. trigo.",
+    "INFO_VERIF_CREATE_PASS_FRIST": "Créer d'abord une passe à bassins, à ralentisseurs, ou à macrorugosités",
     "INFO_VERIF_OK": "Les critères de franchissement sont remplis pour toutes les espèces",
     "INFO_VERIF_VARYING_OK": "Les critères de franchissement sont remplis pour toutes les espèces et toutes les modalités de la passe",
     "WARNING_VERIF_OK_BUT": "Les critères de franchissement sont remplis pour toutes les espèces, mais il y a des avertissements",