diff --git a/science/cantera/Makefile b/science/cantera/Makefile
index 5039ea17a68d..d0bbc8967f23 100644
--- a/science/cantera/Makefile
+++ b/science/cantera/Makefile
@@ -1,75 +1,76 @@
 PORTNAME=	cantera
 DISTVERSIONPREFIX=	v
 DISTVERSION=	2.5.1-611
 PORTREVISION=	1
 DISTVERSIONSUFFIX=	-gc4d6ecc15
 CATEGORIES=	science # chemistry physics
 
 PATCH_SITES=	https://github.com/${GH_ACCOUNT}/${PORTNAME}/commit/
 PATCHFILES=	5720ff659f4bd8dad33d32891fe7d4ae44c72697.patch:-p1 \
 		36e7019cab8e9d9e8388715b5680fea924ce6f52.patch:-p1 # fix "Fix stage directory from appearing in setup_cantera", https://github.com/Cantera/cantera/pull/1102
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Chemical kinetics, thermodynamics, and transport tool suite
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/License.txt
 
 BUILD_DEPENDS=	googletest>0:devel/googletest \
 		${LOCALBASE}/include/boost/algorithm/string.hpp:devel/boost-libs
 LIB_DEPENDS=	libfmt.so:devel/libfmt \
 		libyaml-cpp.so:devel/yaml-cpp
 
 USES=		compiler:c++11-lang eigen:3 scons
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	Cantera
 GH_TUPLE=	LLNL:sundials:887af43:sundials/ext/sundials # bundled sundials is only needed for the Octave option
 
 MAKE_ARGS=	system_eigen='y' \
 		system_sundials='n' \
 		system_fmt='y' \
 		system_yamlcpp='y' \
 		googletest='system' \
 		sundials_include='${LOCALBASE}/include/sundials' \
 		extra_inc_dirs="${LOCALBASE}/include:${LOCALBASE}/include/eigen3" \
 		extra_lib_dirs="${LOCALBASE}/lib" \
 		debug='no' \
 		cc_flags="${CXXFLAGS}" \
 		prefix="${PREFIX}"
 
 ALL_TARGET=	build
 TEST_TARGET=	test # some tests fail, see https://github.com/Cantera/cantera/issues/1095
 
 OPTIONS_DEFINE=		OCTAVE PYTHON
 OPTIONS_DEFAULT=	PYTHON # OCTAVE is off by default because Octave interface is not as frequently requested feature
 OPTIONS_SUB=		yes
 
 OCTAVE_DESC=		Octave support
 OCTAVE_MAKE_ARGS=	matlab_toolbox=y matlab_path=${LOCALBASE}
 OCTAVE_CXXFLAGS=	-I${LOCALBASE}/include/octave-6.4.0/octave
 OCTAVE_LIB_DEPENDS=	liboctave.so:math/octave
+OCTAVE_SUB_FILES=	pkg-message-octave
 
 PYTHON_USES=		python:3.6+
 PYTHON_USE=		PYTHON=cython
 PYTHON_MAKE_ARGS=	python_cmd=${PYTHON_CMD} python_package=full
 PYTHON_MAKE_ARGS_OFF=	python_package="none"
 PYTHON_BUILD_DEPENDS=	${PYNUMPY}
 PYTHON_RUN_DEPENDS=	${PYNUMPY} \
 			${PYTHON_PKGNAMEPREFIX}h5py>0:science/py-h5py@${PY_FLAVOR} \
 			${PYTHON_PKGNAMEPREFIX}matplotlib>0:math/py-matplotlib@${PY_FLAVOR} \
 			${PYTHON_PKGNAMEPREFIX}pandas>0:math/py-pandas@${PY_FLAVOR} \
 			${PYTHON_PKGNAMEPREFIX}ruamel.yaml>0:devel/py-ruamel.yaml@${PY_FLAVOR} \
 			${PYTHON_PKGNAMEPREFIX}scipy>0:science/py-scipy@${PY_FLAVOR}
 
 do-install:
 	cd ${WRKSRC} && \
 		${MAKE_CMD} install \
 			stage_dir="${STAGEDIR}"
 	@${STRIP_CMD} ${STAGEDIR}${PREFIX}/lib/libcantera_shared.so.2.6.0
 
 do-install-PYTHON-on:
 	@${STRIP_CMD} ${STAGEDIR}${PYTHON_SITELIBDIR}/cantera/_cantera.cpython-${PYTHON_VER:S/.//}.so
 
 .include <bsd.port.mk>
diff --git a/science/cantera/files/pkg-message-octave.in b/science/cantera/files/pkg-message-octave.in
new file mode 100644
index 000000000000..7b8ea32e05de
--- /dev/null
+++ b/science/cantera/files/pkg-message-octave.in
@@ -0,0 +1,15 @@
+[
+{ type: install
+  message: <<EOM
+You installed Cantera: Chemical kinetics, thermodynamics,
+and transport tool suite
+
+Since you enabled the Octave support, an additional step
+is now required in order to use it:
+
+Add the line 'addpath %%PREFIX%%/lib/cantera/matlab/toolbox'
+to ~/.octaverc
+
+EOM
+}
+]