Add a note about significant whitespace near the beginning (without using that specific term.) Is expanded on later in the Functions chapter. Fixes OpenTechSchool#33

projectgus · projectgus · commit 3bbd7b8328e3 · 2013-06-22T18:18:12.000+10:00
diff --git a/docs/en/simple_drawing.rst b/docs/en/simple_drawing.rst
@@ -62,6 +62,10 @@ until you click on it::
 
     turtle.exitonclick()
 
+.. note::
+
+   Python is a programming language where horizontal indenting of text is important. We'll learn all about this in the Functions chapter later on, but for now just keep in mind that stray spaces or tabs before any line of Python code will cause an unexpected error.
+
 Drawing a square
 ================
 
