diff --git a/doc/src/region.rst b/doc/src/region.rst
index fbc250ca83..dbe14360ff 100644
--- a/doc/src/region.rst
+++ b/doc/src/region.rst
@@ -212,7 +212,7 @@ and *ellipsoid* the x-, y-, and z- coordinates of the center of the
 sphere/ellipsoid can be specified as an equal-style variable.  And for
 style *cylinder* the two center positions c1 and c2 for the location of
 the cylinder axes can be specified as a equal-style variable.  For styles
-*cone*, *prism*, and *plane* all properties can be defined via
+*block*, *cone*, *prism*, and *plane* all properties can be defined via
 equal-style variables.  For style *plane*, the components of the direction
 vector normal to plane should be either all constants or all defined by
 equal-style variables.