diff --git a/opencv.spec b/opencv.spec
index ce4512b..0522448 100644
--- a/opencv.spec
+++ b/opencv.spec
@@ -270,6 +270,9 @@ install -pm 0644 %{SOURCE4} .cache/ade/
 
 %ifarch ppc64le
 # Disable some altivec vectorization optimization on ppc64le (bug 2051193)
+# Workaround is to force defining CV_FORCE_SIMD128_CPP on ppc64le so as NOT to use intrin_vsx.hpp .
+# https://github.com/opencv/opencv/issues/21465
+# https://github.com/opencv/opencv/issues/19020
 sed -i modules/core/include/opencv2/core/hal/intrin.hpp \
 	-e '\@ifdef CV_FORCE_SIMD128_CPP@i #define CV_FORCE_SIMD128_CPP'
 %endif