diff --git a/README.md b/README.md
index 34846fd..7182e9e 100644
--- a/README.md
+++ b/README.md
@@ -47,3 +47,8 @@ sudo apt install mesa-utils libglfw3-dev libgl-dev libasound2-dev libv4l-dev lib
 * https://www.baeldung.com/linux/opengl-check-working
 * https://ttt.io/glsl-raspberry-pi
 * https://drgeoffathome.wordpress.com/2020/02/03/opengl-without-x-on-raspberry-pi-4-part-1/
+
+## TODO
+
+* PAL/NTSC switch
+* Sync in -> fake midi ?
diff --git a/project/frag7.glsl b/project/frag7.glsl
index 5c4c21f..9d0b5d3 100644
--- a/project/frag7.glsl
+++ b/project/frag7.glsl
@@ -12,8 +12,8 @@ uniform sampler2D iTex0;
 uniform int iFPS;
 
 void main() {
-    vec2 uv = 1 - vUV;
-    // vec2 uv = vUV;
+    // vec2 uv = 1 - vUV;
+    vec2 uv = vUV;
     vec3 c = texture(iTex0, uv).xyz;
     c = mix(c, 1 - c, write_int(uv * 20, vec2(.1, .1), iFPS, 2));
     fragColor = vec4(c, 1);