--- a/doc/geometry.xml
+++ b/doc/geometry.xml
@@ -1,7 +1,7 @@
 <Section><Heading>Face Lattice and Resolution</Heading>
 
 For Bieberbach groups (torsion free crystallographic groups), the following
-functions calcualte free resolutions. This calculation is done by finding a
+functions calculate free resolutions. This calculation is done by finding a
 fundamental domain for the group. 
 
 For a description of the <K>HapResolution</K> datatype, see the
