diff --git a/docs/ART.md b/docs/ART.md
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--- a/docs/ART.md
+++ b/docs/ART.md
@@ -1 +1,18 @@
+# Art 
 
+## Technical notes
+
+Assume game will be played on mobile phones with FullHD-like resolution (1920x1080 with 16:9 aspect).
+Basically, we can assume width of the screen to be of 1080 pixels. All sprites should be scaled to
+that size (in order not to make resulting build too big).
+
+For mobile platforms use ASTC compression formats, for web use PNG.
+
+## Incoming art
+
+If some art pieces are needed, they should be taken from `local` folder. When using art from there, 
+relocate it inside the project accordingly (do not leave used art in `local`, it is just a temporary
+storage to choose from). 
+
+If there's no needed art in `local`, ask me for finding it. Also you can use any art from the internet
+when it is free for use.
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diff --git a/docs/UI.md b/docs/UI.md
index 43e0ad3..ca0ab2f 100644
--- a/docs/UI.md
+++ b/docs/UI.md
@@ -1,2 +1,5 @@
 UI should be fitted for using on portrait-oriented mobile 
 phones with different screen aspect ratios (from 4:3 to 21:9).
+
+All active elements should be of a size suitable for tapping
+with fingers.
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