diff --git a/README.md b/README.md
index 8cab56a..9f5dbda 100644
--- a/README.md
+++ b/README.md
@@ -146,7 +146,7 @@ the internal structure of some sensors is simplified:
   are unified into a single `radiation` type.
   The exact subtype can be specified using the `type` field.
 
-#### `state.open` Field
+#### Not So Boolean `state.open` Field
 
 While the SpaceAPI specification defines `state.open`
 as a boolean (`true` or `false`),