diff --git a/doc/flame/effects.md b/doc/flame/effects.md
index 4e25e89ada..6ef54a53b3 100644
--- a/doc/flame/effects.md
+++ b/doc/flame/effects.md
@@ -538,7 +538,7 @@ Usage example:
 final effect = ColorEffect(
   const Color(0xFF00FF00),
   EffectController(duration: 1.5),
-  opacityFrom = 0.2,
+  opacityFrom: 0.2,
   opacityTo: 0.8,
 );
 ```