diff --git a/src/play.rs b/src/play.rs
index 28c4795..f07a4f7 100644
--- a/src/play.rs
+++ b/src/play.rs
@@ -71,11 +71,11 @@ impl Thread {
             // FIXME: support attrs (docstrings)
             $($Variant $({ $($arg: $Arg),* })?),*
         }
-        impl ::tengri::Command<$State> for $Command {
-            fn execute (&self, $state: &mut $State) -> Perhaps<Self> {
+        impl ::tengri::dizzle::Act<$State> for $Command {
+            fn act (&self, $state: &mut $State) -> Perhaps<Self> {
                 match self {
                     $(Self::$Variant $({ $($arg),* })? => $body,)*
-                    _ => unimplemented!("Command<{}>: {self:?}", stringify!($State)),
+                    _ => unimplemented!("Act<{}>: {self:?}", stringify!($State)),
                 }
             }
         }