diff --git a/Doc/api/newtypes.tex b/Doc/api/newtypes.tex
index 0f2f7a4ad78..d7f2b8bcf2e 100644
--- a/Doc/api/newtypes.tex
+++ b/Doc/api/newtypes.tex
@@ -441,7 +441,7 @@ Foo_Type.ob_type = &PyType_Type;
 
 \begin{cmemberdesc}{PyTypeObject}{int}{tp_basicsize}
 \cmemberline{PyTypeObject}{int}{tp_itemsize}
-  These fields allow calculating the size in byte of instances of
+  These fields allow calculating the size in bytes of instances of
   the type.
 
   There are two kinds of types: types with fixed-length instances have