diff --git a/presto-docs/src/main/sphinx/functions/geospatial.rst b/presto-docs/src/main/sphinx/functions/geospatial.rst
index da603f6a71f5e..6dc9f7a2ddeca 100644
--- a/presto-docs/src/main/sphinx/functions/geospatial.rst
+++ b/presto-docs/src/main/sphinx/functions/geospatial.rst
@@ -268,7 +268,7 @@ Accessors
 
     Returns the minimum convex geometry that encloses all input geometries.
 
-.. function:: ST_CoordDim(Geometry) -> bigint
+.. function:: ST_CoordDim(Geometry) -> tinyint
 
     Return the coordinate dimension of the geometry.