diff --git a/python/src/composition.cpp b/python/src/composition.cpp
index 5176669..67598c0 100644
--- a/python/src/composition.cpp
+++ b/python/src/composition.cpp
@@ -79,7 +79,7 @@ PYBIND11_MODULE(_composition, m) {
         - ``b = site_index / volume``
         - ``volume = len(occupation) / len(allowed_occs)``
 
-      - This definition is consistent with the occupation vector begin organized
+      - This definition is consistent with the occupation vector being organized
         in sublattice blocks:
 
         ::