X-Git-Url: http://nitlanguage.org

diff --git a/lib/scene2d.nit b/lib/scene2d.nit
index 12167c9..2fadd09 100644
--- a/lib/scene2d.nit
+++ b/lib/scene2d.nit
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# 2D management of game elements
+# Framework for 2D management of game elements
 #
 # TODO: collision framework (with quad tree?)
 module scene2d
@@ -48,9 +48,16 @@ class Sprite
 	# height of the sprite
 	var height: Int = 100 is writable
 
+	# X coordinate of left side.
 	fun left: Int do return x - width/2
+
+	# X coordinate of right side.
 	fun right: Int do return x + width/2
+
+	# Y coordinate of top.
 	fun top: Int do return y - height/2
+
+	# Y coordinate of bottom.
 	fun bottom: Int do return y + height/2
 
 	# x velocity (applied by `update')