diff --git a/Docs/source/design.rst b/Docs/source/design.rst
index 73df62108..cac914865 100644
--- a/Docs/source/design.rst
+++ b/Docs/source/design.rst
@@ -88,7 +88,7 @@ for more information).
 
 This means leveraging the AMReX data-structures, macros, and
 functions.  The unit tests (see :ref:`sec:unit_tests`) provide a good
-reference for how interface the Microphysics solvers and physics
+reference for how to interface the Microphysics solvers and physics
 terms with an AMReX-based code.
 
 There are a few places where Microphysics behaves slightly differently