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diff --git a/guile/starlet/transition-effect.scm b/guile/starlet/transition-effect.scm
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+;;
+;; starlet/transition-effect.scm
+;;
+;; Copyright © 2021-2022 Thomas White <taw@bitwiz.org.uk>
+;;
+;; This file is part of Starlet.
+;;
+;; Starlet is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+;;
+(define-module (starlet transition-effect)
+  #:use-module (oop goops)
+  #:export (<transition-effect>
+             transition-effect?))
+
+
+(define-class <transition-effect> (<object>)
+  (func
+    #:init-value #f
+    #:init-keyword #:func
+    #:getter transition-func))
+
+
+(define (transition-effect? a)
+  (is-a? a <transition-effect>))
+