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diff --git a/doc/theme-format.txt b/doc/theme-format.txt
index 7835ca03..95191edd 100644
--- a/doc/theme-format.txt
+++ b/doc/theme-format.txt
@@ -22,6 +22,16 @@ This document has separate sections for each format version. You may
want to read the document in reverse order, since the base features
are discussed under version 1.
+New Features in Theme Format Version 3.1
+========================================
+
+Additional predefined variables are added for positioning expressions:
+
+ frame_x_center: the X center of the entire frame, with respect to the
+ piece currently being drawn.
+ frame_y_center: the Y center of the entire frame, with respect to the
+ piece currently being drawn.
+
New Features in Theme Format Version 3
======================================