1 files changed, 16 insertions, 0 deletions
diff --git a/lib/plum/frame/window_update.rb b/lib/plum/frame/window_update.rb
new file mode 100644
index 0000000..3fe5ecd
--- /dev/null
+++ b/lib/plum/frame/window_update.rb
@@ -0,0 +1,16 @@
+# frozen-string-literal: true
+
+using Plum::BinaryString
+module Plum
+  class Frame::WindowUpdate < Frame
+    register_subclass 0x08
+
+    # Creates a WINDOW_UPDATE frame.
+    # @param stream_id [Integer] the stream ID or 0.
+    # @param wsi [Integer] the amount to increase
+    def initialize(stream_id, wsi)
+      payload = "".b.push_uint32(wsi)
+      initialize_base(type: :window_update, stream_id: stream_id, payload: payload)
+    end
+  end
+end