diff --git a/src/intro_to_uxn_programming.gmo b/src/intro_to_uxn_programming.gmo
index fd3a511..e56e481 100644
--- a/src/intro_to_uxn_programming.gmo
+++ b/src/intro_to_uxn_programming.gmo
@@ -28,10 +28,29 @@ We will use the learn-uxn website by metasyn, that requires a web browser with j
 * varvara computer architecture
 * the stack and postfix notation
 * setting system colors
-* devices labels
+* labels
 * drawing a pixel
 * designing a sprite
 * drawing a sprite
 * draw loop: on-screen vector
 * reading the mouse
 * a small conditional example
+
+# resources
+
+=> ./uxn_tutorial.gmi {uxn tutorial}
+=> ./hexadecimal.gmi {hexadecimal}
+
+## external 
+
+=> https://metasyn.github.io/learn-uxn/ learn-uxn by metasyn
+=> https://wiki.xxiivv.com/site/uxn.html uxn technical documentation
+=> https://wiki.xxiivv.com/site/uxntal_reference.html the uxntal opcode manual
+=> https://wiki.xxiivv.com/site/uxntal_cheatsheet.html uxntal cheatsheet
+=> https://git.sr.ht/~rabbits/uxn uxn repository
+=> https://llllllll.co/t/uxn-virtual-computer/ llllllll forum
+=> https://github.com/hundredrabbits/awesome-uxn awesome uxn: awesome things from the community
+
+irc channel: #uxn on irc.esper.net
+
+=> https://100r.co/site/nasu.html nasu spritesheet editor