diff --git a/assets/shaders/fader.frag.glsl b/assets/shaders/fader.frag.glsl
new file mode 100644
index 0000000..b016530
--- /dev/null
+++ b/assets/shaders/fader.frag.glsl
@@ -0,0 +1,10 @@
+#version 330 core
+
+in vec4 fColour;
+out vec4 colour;
+
+uniform float u_alpha;
+
+void main() {
+  colour = vec4(fColour.xyz, 1.0 - u_alpha);
+}