diff --git a/doc/sphinx/src/databox.rst b/doc/sphinx/src/databox.rst
index 48ab9d202..4bc303b26 100644
--- a/doc/sphinx/src/databox.rst
+++ b/doc/sphinx/src/databox.rst
@@ -625,6 +625,6 @@ returns the total size of the underlying array in bytes.
 
 .. cpp:function:: int dim(int i) const;
 
-returns the size in a given dimension/direction, indexed from zero.
+returns the size in a given dimension/direction, indexed from one.
 
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