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

diff --git a/examples/draw_operation.nit b/examples/draw_operation.nit
index 2db1595..61f14eb 100644
--- a/examples/draw_operation.nit
+++ b/examples/draw_operation.nit
@@ -14,9 +14,42 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Draws an arithmetic operation to the terminal
+# Sample program which draws an arithmetic operation to the terminal
+#
+# Output (and input) example:
+# ~~~nitish
+# Left operand: 23
+# Right operand: 15
+# Operator (+, -, *, /, %): +
+# Char to display: #
+# Size of text: 5
+# Space between digits: 1
+#       ##### #####
+#           #     #
+#       ##### #####
+#       #         #
+#       ##### #####
+#
+#         #   #####
+#   +    ##   #
+# +++++   #   #####
+#   +     #       #
+#       ##### #####
+#
+# __________________
+#
+#       ##### #####
+#           # #   #
+#       ##### #####
+#           # #   #
+#       ##### #####
+# ~~~
 module draw_operation
 
+`{
+	#include <math.h>
+`}
+
 redef enum Int
 	fun n_chars: Int `{
 		int c;