diff --git a/app/components/meeting/edit-meeting-modal.js b/app/components/meeting/edit-meeting-modal.js
index 411a7a4536..ee4ad6f953 100644
--- a/app/components/meeting/edit-meeting-modal.js
+++ b/app/components/meeting/edit-meeting-modal.js
@@ -29,6 +29,7 @@ export default class MeetingEditMeetingComponent extends Component {
   @service mandatees;
   @service decisionReportGeneration;
   @service intl;
+  @service router;
 
   @tracked isAnnexMeeting = false;
   @tracked isEditingNumberRepresentation = false;
@@ -145,7 +146,7 @@ export default class MeetingEditMeetingComponent extends Component {
           await this.mandatees.getApplicationSecretary();
         this.secretary = currentApplicationSecretary;
       }
-      // if a meeting had no secretary yet we don't set the current active default one automatically     
+      // if a meeting had no secretary yet we don't set the current active default one automatically
     }
   });
 
@@ -294,7 +295,31 @@ export default class MeetingEditMeetingComponent extends Component {
         saveActivities.push(this.decisionPublicationActivity.save());
       }
 
+      // Check if an annex meeting exists, if so update its planned start
+      const annexMeeting = yield this.store.queryOne('meeting', {
+        filter: {
+          'main-meeting': {
+            ':id:': this.args.meeting.id,
+          }
+        }
+      });
+      if (annexMeeting?.id) {
+        // these 2 properties cannot be changed on the annex meeting
+        annexMeeting.plannedStart = this.args.meeting.plannedStart;
+        annexMeeting.number = this.args.meeting.number;
+        // numberRepresentation still needs to be updated manually and will trigger new reports/minutes
+        saveActivities.push(annexMeeting.save());
+      }
+
       yield Promise.all(saveActivities);
+
+      if (annexMeeting?.id) {
+        this.toaster.success(this.intl.t('annex-meeting-was-saved', {
+          title: annexMeeting.numberRepresentation,
+          timeout: 10000,
+        }));
+      }
+
       if (!this.isPreKaleidos || !this.isNew) {
         if (
           currentMeetingSecretary?.uri !== this.secretary?.uri ||
diff --git a/translations/nl-be.json b/translations/nl-be.json
index e1bec5546e..8b34a1551f 100644
--- a/translations/nl-be.json
+++ b/translations/nl-be.json
@@ -1495,5 +1495,6 @@
   "no-meeting-found-for-submission": "Er is geen geldige vergadering gevonden voor deze indiening",
   "show-definitive-cases-only": "Toon enkel dossiers zonder definitieve goedkeuring",
   "empty-internal-review": "Interne opmerkingen leegmaken",
-  "empty-internal-review-message": "Bent u zeker dat u alle interne opmerkingen voor de goedgekeurde agendapunten op deze agenda wil leegmaken?\nDeze actie kan niet ongedaan worden gemaakt.\nDe interne opmerkingen van nieuwe agendapunten blijven ongewijzigd."
+  "empty-internal-review-message": "Bent u zeker dat u alle interne opmerkingen voor de goedgekeurde agendapunten op deze agenda wil leegmaken?\nDeze actie kan niet ongedaan worden gemaakt.\nDe interne opmerkingen van nieuwe agendapunten blijven ongewijzigd.",
+  "annex-meeting-was-saved": "De annex vergadering {title} is aangepast. Verifieer of de beslissingen en notulen nog up-to-date zijn."
 }