diff --git a/lib/diaspora_federation/validators/photo_validator.rb b/lib/diaspora_federation/validators/photo_validator.rb
index af9f5f1..fb192c0 100644
--- a/lib/diaspora_federation/validators/photo_validator.rb
+++ b/lib/diaspora_federation/validators/photo_validator.rb
@@ -16,6 +16,8 @@ module DiasporaFederation
 
       rule :status_message_guid, guid: {nilable: true}
 
+      rule :text, length: {maximum: 65_535}
+
       rule :height, :numeric
 
       rule :width, :numeric
diff --git a/spec/lib/diaspora_federation/validators/photo_validator_spec.rb b/spec/lib/diaspora_federation/validators/photo_validator_spec.rb
index 1b37864..a933e1a 100644
--- a/spec/lib/diaspora_federation/validators/photo_validator_spec.rb
+++ b/spec/lib/diaspora_federation/validators/photo_validator_spec.rb
@@ -44,5 +44,13 @@ module DiasporaFederation
         end
       end
     end
+
+    describe "#text" do
+      it_behaves_like "a property with a value validation/restriction" do
+        let(:property) { :text }
+        let(:wrong_values) { ["a" * 65_536] }
+        let(:correct_values) { ["a" * 65_535, nil, ""] }
+      end
+    end
   end
 end