diff --git a/impeller/docs/shader_optimization.md b/impeller/docs/shader_optimization.md
index 397d4787f3f66..b557da720b137 100644
--- a/impeller/docs/shader_optimization.md
+++ b/impeller/docs/shader_optimization.md
@@ -267,7 +267,7 @@ vec4 FrobnicateColor(vec4 color) {
   vec4 result;
 
   if (color.a == 0) {
-    result vec4(0);
+    result = vec4(0);
   } else {
     result = DoExtremelyExpensiveThing(color);
   }