diff --git a/api-actor-State.md b/api-actor-State.md
index 94acc51..72bd9d2 100644
--- a/api-actor-State.md
+++ b/api-actor-State.md
@@ -94,7 +94,7 @@ struct State
 
 - `InStateSequence`
 
-   TODO
+   Returns `true` if this state is within a contiguous state sequence beginning with `base`.
 
 - `ValidateSpriteFrame`