diff --git a/bookwyrm/templates/book/file_link_modal.html b/bookwyrm/templates/book/file_link_modal.html
index 3870eb8e6..5ffe8ce80 100644
--- a/bookwyrm/templates/book/file_link_modal.html
+++ b/bookwyrm/templates/book/file_link_modal.html
@@ -14,16 +14,19 @@
 <div class="field">
     <label class="label" for="id_url">{% trans "Name:" %}</label>
     {{ file_link_form.name }}
+    {% include 'snippets/form_errors.html' with errors_list=file_link_form.name.errors id="desc_name" %}
 </div>
 
 <div class="columns">
     <div class="column is-four-fifths">
         <label class="label" for="id_url">{% trans "URL:" %}</label>
-        <input type="url" name="url" maxlength="255" class="input" required="" id="id_url" value="{% firstof file_link_form.url.value "" %}" placeholder="https://...">
+        <input type="url" name="url" maxlength="255" class="input" required="" id="id_url" value="{% firstof file_link_form.url.value "" %}" placeholder="https://..." aria-describedby="desc_name">
+        {% include 'snippets/form_errors.html' with errors_list=file_link_form.url.errors id="desc_url" %}
     </div>
     <div class="column is-one-fifth">
         <label class="label" for="id_filetype">{% trans "File type:" %}</label>
         <input type="text" name="filetype" maxlength="5" class="input" required="" id="id_filetype" value="{% firstof file_link_form.filetype.value "" %}" placeholder="PDF">
+        {% include 'snippets/form_errors.html' with errors_list=file_link_form.filetype.errors id="desc_filetype" %}
     </div>
 </div>
 
diff --git a/bookwyrm/views/books/links.py b/bookwyrm/views/books/links.py
index 722d0545a..949c807f5 100644
--- a/bookwyrm/views/books/links.py
+++ b/bookwyrm/views/books/links.py
@@ -28,10 +28,11 @@ class FileLink(View):
         return TemplateResponse(request, "book/file_link_page.html", data)
 
     @transaction.atomic
-    def post(self, request, book_id):
+    def post(self, request, book_id, link_id=None):
         """Add a link to a copy of the book you can read"""
         book = get_object_or_404(models.Book.objects.select_subclasses(), id=book_id)
-        form = forms.FileLinkForm(request.POST)
+        link = get_object_or_404(models.FileLink, id=link_id) if link_id else None
+        form = forms.FileLinkForm(request.POST, instance=link)
         if not form.is_valid():
             data = {"file_link_form": form, "book": book}
             return TemplateResponse(request, "book/file_link_page.html", data)