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diff --git a/samples/01_rendering_basics/04_sprites/app/main.rb b/samples/01_rendering_basics/04_sprites/app/main.rb
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+++ b/samples/01_rendering_basics/04_sprites/app/main.rb
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+=begin
+
+APIs listing that haven't been encountered in a previous sample apps:
+
+- args.outputs.sprites: An array. Values in this array generate
+  sprites on the screen. The location of the sprite is assumed to
+  be under the mygame/ directory (the exception being dragonruby.png).
+
+=end
+
+
+# For all other display outputs, Sprites are your solution
+# Sprites import images and display them with a certain rectangular area
+# The image can be of any usual format and should be located within the folder,
+# similar to additional fonts.
+
+# Sprites have the following parameters
+# Rectangular area (x, y, width, height)
+# The image (path)
+# Rotation (angle)
+# Alpha (a)
+
+def tick args
+  tick_instructions args, "Sample app shows how to render a sprite. Set its alpha, and rotate it."
+  args.outputs.labels <<  [460, 600, "Sprites (x, y, w, h, path, angle, a)"]
+  args.outputs.sprites << [460, 470, 128, 101, 'dragonruby.png']
+  args.outputs.sprites << [610, 470, 128, 101, 'dragonruby.png', args.state.tick_count % 360]
+  args.outputs.sprites << [760, 470, 128, 101, 'dragonruby.png', 0, args.state.tick_count % 255]
+end
+
+def tick_instructions args, text, y = 715
+  return if args.state.key_event_occurred
+  if args.inputs.mouse.click ||
+     args.inputs.keyboard.directional_vector ||
+     args.inputs.keyboard.key_down.enter ||
+     args.inputs.keyboard.key_down.escape
+    args.state.key_event_occurred = true
+  end
+
+  args.outputs.debug << [0, y - 50, 1280, 60].solid
+  args.outputs.debug << [640, y, text, 1, 1, 255, 255, 255].label
+  args.outputs.debug << [640, y - 25, "(click to dismiss instructions)" , -2, 1, 255, 255, 255].label
+end