diff --git a/src/ifcopenshell-python/docs/ifcopenshell-python/geometry_processing.rst b/src/ifcopenshell-python/docs/ifcopenshell-python/geometry_processing.rst
index e3149e911b..8fef2150a4 100644
--- a/src/ifcopenshell-python/docs/ifcopenshell-python/geometry_processing.rst
+++ b/src/ifcopenshell-python/docs/ifcopenshell-python/geometry_processing.rst
@@ -294,7 +294,7 @@ Geometry serialisation
 Geometry may be serialised into many different formats using
 :doc:`IfcConvert<../ifcconvert>`. Alternatively, you may also access the
 serialiser with Python to customise the conversion, such as by writing a script
-the modifies the IFC on the fly before converting it, or writing complex
+that modifies the IFC on the fly before converting it, or writing complex
 include and exclude filters.
 
 Here is a typical example to serialising to glTF / glb. Example settings to