diff --git a/froide_govplan/forms.py b/froide_govplan/forms.py
index dc6e8a3..8854cce 100644
--- a/froide_govplan/forms.py
+++ b/froide_govplan/forms.py
@@ -1,11 +1,13 @@
 from django import forms
+from django.utils import timezone
 from django.utils.safestring import mark_safe
+from django.utils.translation import gettext_lazy as _
 
 import bleach
 from bleach.linkifier import Linker
 from tinymce.widgets import TinyMCE
 
-from .models import GovernmentPlan, GovernmentPlanUpdate
+from .models import GovernmentPlan, GovernmentPlanUpdate, PlanRating, PlanStatus
 
 BLEACH_OPTIONS = {
     "tags": [
@@ -47,7 +49,9 @@ class BleachField(forms.CharField):
 
 
 class GovernmentPlanForm(forms.ModelForm):
-    description = BleachField(required=False, widget=TinyMCE(attrs={"cols": 80, "rows": 30}))
+    description = BleachField(
+        required=False, widget=TinyMCE(attrs={"cols": 80, "rows": 30})
+    )
 
     class Meta:
         model = GovernmentPlan
@@ -55,8 +59,74 @@ class GovernmentPlanForm(forms.ModelForm):
 
 
 class GovernmentPlanUpdateForm(forms.ModelForm):
-    content = BleachField(required=False, widget=TinyMCE(attrs={"cols": 80, "rows": 30}))
+    content = BleachField(
+        required=False, widget=TinyMCE(attrs={"cols": 80, "rows": 30})
+    )
 
     class Meta:
         model = GovernmentPlanUpdate
         fields = "__all__"
+
+
+class GovernmentPlanUpdateProposalForm(forms.ModelForm):
+    title = forms.CharField(
+        label=_("title"),
+        help_text=_("Summarize the update in a title."),
+        widget=forms.TextInput(
+            attrs={
+                "class": "form-control",
+            }
+        ),
+    )
+    content = forms.CharField(
+        required=False,
+        label=_("details"),
+        help_text=_("Optionally give more details."),
+        widget=forms.Textarea(attrs={"class": "form-control", "rows": "3"}),
+    )
+    url = forms.URLField(
+        label=_("source URL"),
+        help_text=_("Please give provide a link."),
+        widget=forms.URLInput(
+            attrs={"class": "form-control", "placeholder": "https://"}
+        ),
+    )
+    status = forms.ChoiceField(
+        label=_("status"),
+        help_text=_("Has the status of the plan changed?"),
+        choices=[("", "---")] + PlanStatus.choices,
+        required=False,
+    )
+    rating = forms.ChoiceField(
+        label=_("rating"),
+        help_text=_("What's your rating of the current implementation?"),
+        choices=[("", "---")] + PlanRating.choices,
+        required=False,
+    )
+
+    class Meta:
+        model = GovernmentPlanUpdate
+        fields = (
+            "title",
+            "content",
+            "url",
+            "status",
+            "rating",
+        )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+    def save(self, plan, user):
+        """
+        This doesn't save instance, but saves
+        the change proposal.
+        """
+        data = self.cleaned_data
+        plan.proposals = plan.proposals or {}
+        plan.proposals[user.id] = {
+            "data": data,
+            "timestamp": timezone.now().isoformat(),
+        }
+        plan.save()
+        return plan
diff --git a/froide_govplan/templates/froide_govplan/detail.html b/froide_govplan/templates/froide_govplan/detail.html
index 8eb064a..ed84cdf 100644
--- a/froide_govplan/templates/froide_govplan/detail.html
+++ b/froide_govplan/templates/froide_govplan/detail.html
@@ -6,6 +6,8 @@
 {% load follow_tags %}
 {% load govplan %}
 {% load fds_ogimage %}
+{% load form_helper %}
+{% load content_helper %}
 
 {% block title %}{{ object.title }}{% endblock %}
 
@@ -190,6 +192,51 @@
           </div>
       </div>
     {% endfor %}
+    <div class="col col-12 col-lg-6 d-flex" id="update-{{ update.pk }}">
+      <div class="box-card border-blue shadow-blue">
+        <div>
+          <div class="box-card-header bg-blue-100 d-flex justify-content-center p-3 p-md-4 tight-margin flex-column">
+            <h3 class="h4">Neue Entwicklung melden</h3>
+          </div>
+          <div class="p-3 p-md-4">
+            {% if request.user.is_authenticated %}
+              <button type="button" class="btn btn-light" data-toggle="modal" data-target="#govplanupdate-proposal">
+                Entwicklung melden
+              </button>
+              <div class="modal" data-teleport="body" tabindex="-1" role="dialog" id="govplanupdate-proposal">
+                <div class="modal-dialog modal-lg" role="document">
+                  <div class="modal-content">
+                    <div class="modal-header">
+                      <h5 class="modal-title">
+                        Neue Entwicklung melden
+                      </h5>
+                      <button type="button" class="close" data-dismiss="modal" aria-label="Close">
+                        <span aria-hidden="true">&times;</span>
+                      </button>
+                    </div>
+                    <div class="modal-body">
+                      <form method="post" action="{% url 'govplan:propose_planupdate' gov=object.government.slug plan=object.slug %}">
+                        {% csrf_token %}
+                        {% render_form update_proposal_form %}
+                        <button type="submit" class="btn btn-primary">
+                          Neue Entwicklung melden
+                        </button>
+                      </form>
+                    </div>
+                  </div>
+                </div>
+              </div>
+            {% else %}
+              <a class="btn btn-light" href="{{ object.get_absolute_url|make_login_redirect_url }}">
+                Bitte einloggen, um eine Entwicklung zu melden
+              </a>
+            {% endif %}
+          </div>
+        </div>
+      </div>
+    </div>
   </div>
+
+
 </div>
 {% endblock %}
diff --git a/froide_govplan/urls.py b/froide_govplan/urls.py
index 76d6ae0..163e426 100644
--- a/froide_govplan/urls.py
+++ b/froide_govplan/urls.py
@@ -4,6 +4,7 @@ from django.utils.translation import pgettext_lazy
 from .views import (
     GovPlanDetailOGView,
     GovPlanDetailView,
+    GovPlanProposeUpdateView,
     GovPlanSectionDetailView,
     search,
 )
@@ -22,6 +23,11 @@ urlpatterns = [
         GovPlanDetailOGView.as_view(),
         name="plan_og",
     ),
+    path(
+        pgettext_lazy("url part", "<slug:gov>/plan/<slug:plan>/propose-update/"),
+        GovPlanProposeUpdateView.as_view(),
+        name="propose_planupdate",
+    ),
     path(
         pgettext_lazy("url part", "<slug:gov>/<slug:section>/"),
         GovPlanSectionDetailView.as_view(),
diff --git a/froide_govplan/views.py b/froide_govplan/views.py
index 4e6d213..5da4915 100644
--- a/froide_govplan/views.py
+++ b/froide_govplan/views.py
@@ -1,13 +1,17 @@
-from django.shortcuts import get_object_or_404, render
-from django.views.generic import DetailView
+from django.contrib import messages
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.shortcuts import get_object_or_404, redirect, render
+from django.utils.translation import gettext_lazy as _
+from django.views.generic import DetailView, UpdateView
 
+from .forms import GovernmentPlanUpdateProposalForm
 from .models import Government, GovernmentPlan, GovernmentPlanSection
 
 
 class GovernmentMixin:
-    def get(self, *args, **kwargs):
+    def dispatch(self, *args, **kwargs):
         self.get_government()
-        return super().get(*args, **kwargs)
+        return super().dispatch(*args, **kwargs)
 
     def get_government(self):
         filter_kwarg = {}
@@ -54,6 +58,8 @@ class GovPlanDetailView(GovernmentMixin, DetailView):
             "-timestamp"
         )
         context["section"] = self.get_section()
+        if self.request.user.is_authenticated:
+            context["update_proposal_form"] = GovernmentPlanUpdateProposalForm()
         # For CMS toolbar
         self.request.govplan = self.object
         return context
@@ -63,6 +69,32 @@ class GovPlanDetailOGView(GovPlanDetailView):
     template_name = "froide_govplan/plan_og.html"
 
 
+class GovPlanProposeUpdateView(GovernmentMixin, LoginRequiredMixin, UpdateView):
+    template_name = "publicbody/add_proposal.html"
+    slug_url_kwarg = "plan"
+    form_class = GovernmentPlanUpdateProposalForm
+
+    def get_queryset(self):
+        qs = GovernmentPlan.objects.filter(government=self.government)
+        if self.request.user.is_authenticated and self.request.user.is_staff:
+            return qs
+        return qs.filter(public=True)
+
+    def get_success_url(self):
+        return self.object.get_absolute_url()
+
+    def form_valid(self, form):
+        form.save(self.object, self.request.user)
+        messages.add_message(
+            self.request,
+            messages.INFO,
+            _(
+                "Thank you for your proposal. We will send you an email when it has been approved."
+            ),
+        )
+        return redirect(self.object)
+
+
 def search(request):
     plans = GovernmentPlan.objects.search(request.GET.get("q", ""))