update readme

README.md

@@ -307,10 +307,11 @@ Features added by @LingDong-:
 
 ## Porting from p5.js
 
-- `createCanvas` must be run before any functions that edit the canvas are called.
+- `createCanvas` must be run before any rendering functions are called. If users don't do it before the draw loop starts, then q5 will run `createCanvas(100, 100)` automatically.
 - `color` function only accepts numeric input, hex, and simple named colors. It doesn't parse strings like `color('hsl(160, 100%, 50%)')`.
-- `colorMode` function only accepts "rgb", "srgb", or "oklch" because the other formats p5 still supports like hsv are obsolete.
-- `noise` function's default noise algorithm is true perlin noise, p5's noise is called "blocky" noise using it requires loading the src/q5-noisier.js module.
+- `fill` and `stroke` can accept any CSS color string.
+- `colorMode` function only accepts "rgb", "srgb", or "oklch" because other formats that p5 still supports like hsv are obsolete.
+- `noise` function's default noise algorithm is perlin noise. p5's default noise is called "blocky" noise in q5 and using it requires loading the src/q5-noisier.js module.
 
 ## Size Comparison