diff --git a/science/py-ase/Makefile b/science/py-ase/Makefile
index 3ee377518b57..b2fe14bbd783 100644
--- a/science/py-ase/Makefile
+++ b/science/py-ase/Makefile
@@ -1,24 +1,24 @@
 PORTNAME=	ase
 DISTVERSION=	3.22.1
-CATEGORIES=	science python
+CATEGORIES=	science python # chemistry
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Atomic simulation environment
 
 LICENSE=	LGPL21
 LICENSE_FILE=	${WRKSRC}/COPYING.LESSER
 
 RUN_DEPENDS=	${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}matplotlib>=3.1.0:math/py-matplotlib@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}scipy>=1.1.0:science/py-scipy@${PY_FLAVOR} \
 		nwchem:science/nwchem
 # optional dependencies: x11-toolkits/py-tkinter, www/py-flask (see https://wiki.fysik.dtu.dk/ase/install.html)
 
 USES=		python:3.7+
 USE_PYTHON=	distutils concurrent autoplist
 
 NO_ARCH=	yes
 
 .include <bsd.port.mk>