diff --git a/misc/quantum++/Makefile b/misc/quantum++/Makefile
index a5551546227b..57acbb51a17e 100644
--- a/misc/quantum++/Makefile
+++ b/misc/quantum++/Makefile
@@ -1,38 +1,39 @@
 PORTNAME=	quantum++
 DISTVERSIONPREFIX=	v
 DISTVERSION=	7.0.0
 CATEGORIES=	misc devel
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	C++ header-only general purpose quantum computing library
 WWW=		https://github.com/softwareQinc/qpp
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
 TEST_DEPENDS=	googletest>0:devel/googletest
 
 USES=		cmake:testing compiler:c++17-lang eigen:3,build,run localbase:ldflags
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	softwareQinc
 GH_PROJECT=	qpp
 
 CMAKE_TESTING_ON=	QPP_ENABLE_TESTING
 CMAKE_TESTING_TARGET=	unit_tests
 
 CXXFLAGS=	-I${LOCALBASE}/include/eigen3
 
 NO_BUILD=	yes
 NO_ARCH=	yes
 
 post-test: # run tests
 	@${BUILD_WRKSRC}/unit_tests/unit_tests
 
 # tests as of 6.0:
 # [==========] 457 tests from 325 test suites ran. (1585 ms total)
 # [  PASSED  ] 457 tests.
 
 # tests as of 7.0: fail to compile, see https://github.com/softwareQinc/qpp/issues/196
+# ... tests need Eigen version to 5.0.0, but ports has 3.4.0
 
 .include <bsd.port.mk>