diff --git a/math/combblas/Makefile b/math/combblas/Makefile
index 8e5b71aea567..9f55939ecad2 100644
--- a/math/combblas/Makefile
+++ b/math/combblas/Makefile
@@ -1,29 +1,31 @@
 PORTNAME=	CombBLAS
 DISTVERSIONPREFIX=	v
 DISTVERSION=	2.0.0
 CATEGORIES=	math
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Combinatorial BLAS library: an extensible parallel graph library
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 ONLY_FOR_ARCHS=	amd64 powerpc64 powerpc64le
 ONLY_FOR_ARCHS_REASON=	fails to build: uses x86 asm
 
 LIB_DEPENDS=	libmpi.so:net/mpich
 RUN_DEPENDS=	${LOCALBASE}/lib/gcc${GCC_DEFAULT}/libgcc_s.so.1:lang/gcc${GCC_DEFAULT} # because of the link flags induced by mpich
 
 USES=		cmake:testing compiler:c++14-lang localbase:ldflags tar:tgz
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	PASSIONLab
 
 CMAKE_ON=	BUILD_SHARED_LIBS
 
+# many tests fail, see https://github.com/PASSIONLab/CombBLAS/issues/15
+
 post-extract:
 	@cd ${WRKSRC}/include && ${RM} .DS_Store ._.DS_Store CombBLAS/._CombBLAS.h
 
 .include <bsd.port.mk>