diff --git a/graphics-protocol.asciidoc b/graphics-protocol.asciidoc
index dfff94547..d71dc015d 100644
--- a/graphics-protocol.asciidoc
+++ b/graphics-protocol.asciidoc
@@ -234,7 +234,7 @@ allows rendering of text on top of images.
 == Control data reference
 
 The table below shows all the control data keys as well as what values they can
-take, and the default value they take when missing.
+take, and the default value they take when missing. All integers are 32-bit. 
 
 [cols="^1,<3,^1,<6"]
 |===