update doc for SVG() in alignment with comment: https://github.com/svgdotjs/svg.js...

diff --git a/README.md b/README.md
index 7ccd6289a611733388bd2f46eb0fc4481763cf0e..6d39156539ca528adbc3c5cbb1139ccdb4d43566 100644 (file)
--- a/README.md
+++ b/README.md
@@ -23,6 +23,14 @@ var draw = SVG('drawing').size(300, 300)
 var rect = draw.rect(100, 100).attr({ fill: '#f06' })
 ```
 The first argument can either be an id of the element or the selected element itself.
+Be aware that the HTML element must exist before running the svg.js code.
+
+Given this HTML:
+
+```html
+<div id="drawing"></div>
+```
+
 This will generate the following output:
 
 ```html