diff --git a/science/py-dftd4/Makefile b/science/py-dftd4/Makefile
index 6f6a6e65e03d..6508be963def 100644
--- a/science/py-dftd4/Makefile
+++ b/science/py-dftd4/Makefile
@@ -1,27 +1,27 @@
 PORTNAME=	dftd4
 DISTVERSION=	3.5.0
-CATEGORIES=	science python
+CATEGORIES=	science python # chemistry
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Python API of the DFT-D4 project
 WWW=		https://www.chemie.uni-bonn.de/pctc/mulliken-center/software/dftd4
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}cffi>0:devel/py-cffi@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}meson-python>0:devel/meson-python@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}wheel>0:devel/py-wheel@${PY_FLAVOR}
 LIB_DEPENDS=	libdftd4.so:science/dftd4
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}cffi>0:devel/py-cffi@${PY_FLAVOR} \
 		${PYNUMPY}
 
 USES=		pkgconfig python
 USE_PYTHON=	pep517 autoplist
 
 post-install:
 	@${STRIP_CMD} ${STAGEDIR}${PYTHON_SITELIBDIR}/dftd4/_libdftd4${PYTHON_EXT_SUFFIX}.so
 
 .include <bsd.port.mk>