diff --git a/doc/postgis.xml b/doc/postgis.xml
index cc39c93bc..77a27a0fd 100644
--- a/doc/postgis.xml
+++ b/doc/postgis.xml
@@ -3587,6 +3587,17 @@ dimension
+
+ zmflag(geometry)
+
+
+ Returns ZM (dimension semantic) flag of the geometries as
+ a small int. Values are: 0=2d, 1=3dm, 2=3dz, 3=4d.
+
+
+
+
+
length2d(geometry)