diff --git a/td/telegram/BackgroundType.cpp b/td/telegram/BackgroundType.cpp
index 4546d7477..816f9958a 100644
--- a/td/telegram/BackgroundType.cpp
+++ b/td/telegram/BackgroundType.cpp
@@ -238,6 +238,11 @@ bool operator==(const BackgroundFill &lhs, const BackgroundFill &rhs) {
          lhs.fourth_color_ == rhs.fourth_color_;
 }
 
+StringBuilder &operator<<(StringBuilder &string_builder, const BackgroundFill &fill) {
+  return string_builder << "BackgroundFill[" << fill.top_color_ << '~' << fill.bottom_color_ << '~' << fill.third_color_
+                        << '~' << fill.fourth_color_ << ':' << fill.rotation_angle_ << ']';
+}
+
 string BackgroundType::get_mime_type() const {
   CHECK(has_file());
   return type_ == Type::Pattern ? "image/png" : "image/jpeg";
@@ -340,6 +345,8 @@ StringBuilder &operator<<(StringBuilder &string_builder, const BackgroundType &t
       UNREACHABLE();
       break;
   }
+  // string_builder << ' ' << type.is_blurred_ << ' ' << type.is_moving_ << ' ' << type.intensity_ << ' ' << type.fill_
+  //                << ' ' << type.theme_name_ << ' ';
   return string_builder << '[' << type.get_link() << ']';
 }
 
diff --git a/td/telegram/BackgroundType.h b/td/telegram/BackgroundType.h
index 0b121ca57..494aae353 100644
--- a/td/telegram/BackgroundType.h
+++ b/td/telegram/BackgroundType.h
@@ -54,6 +54,8 @@ class BackgroundFill {
 
   friend bool operator==(const BackgroundFill &lhs, const BackgroundFill &rhs);
 
+  friend StringBuilder &operator<<(StringBuilder &string_builder, const BackgroundFill &fill);
+
   friend class BackgroundType;
 
   static Result<BackgroundFill> get_background_fill(Slice name);
@@ -63,6 +65,8 @@ class BackgroundFill {
 
 bool operator==(const BackgroundFill &lhs, const BackgroundFill &rhs);
 
+StringBuilder &operator<<(StringBuilder &string_builder, const BackgroundFill &fill);
+
 class BackgroundType {
   enum class Type : int32 { Wallpaper, Pattern, Fill, ChatTheme };
   Type type_ = Type::Fill;