diff --git a/backend/domain/simple_submission_checks/constraints/README.md b/backend/domain/simple_submission_checks/constraints/README.md
index 005f4c29..c94531c9 100644
--- a/backend/domain/simple_submission_checks/constraints/README.md
+++ b/backend/domain/simple_submission_checks/constraints/README.md
@@ -28,6 +28,7 @@ De `zip_name` legt de naam van de zip vast en de `sub_constraints` bevat een lij
 - `FileConstraint`
 - `NotPresentConstraint`
 - `ExtensionNotPresentConstraint`
+- `ExtensionOnlyPresentConstraint`
 
 De `global_constraints` zijn constraints die gelden voor de volledige zip indiening. Een element in de lijst van global constraints kan één van volgende types zijn:
 
diff --git a/frontend/src/components/SimpleTests/SimpleTests.tsx b/frontend/src/components/SimpleTests/SimpleTests.tsx
index d79256f6..ca841827 100644
--- a/frontend/src/components/SimpleTests/SimpleTests.tsx
+++ b/frontend/src/components/SimpleTests/SimpleTests.tsx
@@ -107,6 +107,10 @@ function json_to_submission(json: any): Submission {
             case 'EXTENSION_NOT_PRESENT': { 
                 constraint = new Constraint('EXTENSION_NOT_PRESENT', json['extension'], id, parent_id, depth);
                 break; 
+            }
+            case 'EXTENSION_ONLY_PRESENT': { 
+                constraint = new Constraint('EXTENSION_ONLY_PRESENT', json['extension'], id, parent_id, depth);
+                break; 
             } 
         } 
 
@@ -773,24 +777,35 @@ export default function SimpleTests(props: {
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'DIRECTORY')}>{t('submission_files.menu.directory')}</button>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'NOT_PRESENT')}>{t('submission_files.menu.not_present')}</button>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'EXTENSION_NOT_PRESENT')}>{t('submission_files.menu.extension_not_present')}</button>
+                                                                <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'EXTENSION_ONLY_PRESENT')}>{t('submission_files.menu.extension_only_present')}</button>
                                                             </div>
                                                         case 'DIRECTORY':
                                                             return <div>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'FILE')}>{t('submission_files.menu.file')}</button>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'NOT_PRESENT')}>{t('submission_files.menu.not_present')}</button>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'EXTENSION_NOT_PRESENT')}>{t('submission_files.menu.extension_not_present')}</button>
+                                                                <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'EXTENSION_ONLY_PRESENT')}>{t('submission_files.menu.extension_only_present')}</button>
                                                             </div>
                                                         case 'NOT_PRESENT':
                                                             return <div>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'FILE')}>{t('submission_files.menu.file')}</button>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'DIRECTORY')}>{t('submission_files.menu.directory')}</button>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'EXTENSION_NOT_PRESENT')}>{t('submission_files.menu.extension_not_present')}</button>
+                                                                <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'EXTENSION_ONLY_PRESENT')}>{t('submission_files.menu.extension_only_present')}</button>
                                                             </div>
                                                         case 'EXTENSION_NOT_PRESENT':
                                                             return <div>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'FILE')}>{t('submission_files.menu.file')}</button>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'DIRECTORY')}>{t('submission_files.menu.directory')}</button>
                                                                 <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'NOT_PRESENT')}>{t('submission_files.menu.not_present')}</button>
+                                                                <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'EXTENSION_ONLY_PRESENT')}>{t('submission_files.menu.extension_only_present')}</button>
+                                                            </div>
+                                                        case 'EXTENSION_ONLY_PRESENT':
+                                                            return <div>
+                                                                <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'FILE')}>{t('submission_files.menu.file')}</button>
+                                                                <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'DIRECTORY')}>{t('submission_files.menu.directory')}</button>
+                                                                <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'NOT_PRESENT')}>{t('submission_files.menu.not_present')}</button>
+                                                                <button className="menu-not-last-item" onClick={() => handleChangeConstraintType(constraint.id, 'EXTENSION_NOT_PRESENT')}>{t('submission_files.menu.extension_not_present')}</button>
                                                             </div>
                                                     } })()}
                                                 <button onClick={() => handleDeleteConstraint(constraint.id)}>{t('submission_files.menu.remove')}</button>