diff --git a/README.rst b/README.rst
index 1cf11df..2c52ae0 100644
--- a/README.rst
+++ b/README.rst
@@ -23,7 +23,7 @@ Install from source::
 
 Dependencies::
 
-  cupy, scikit-build
+  cupy, scikit-build, swig
 
 Tests:
   See tests/