diff --git a/srcpkgs/boost/patches/install-strip-destdir.patch b/srcpkgs/boost/patches/install-strip-destdir.patch
index 61047c5967b..d931a5d4117 100644
--- a/srcpkgs/boost/patches/install-strip-destdir.patch
+++ b/srcpkgs/boost/patches/install-strip-destdir.patch
@@ -1,3 +1,9 @@
+boost doesn't support DESTDIR or something like that,
+hence, we need --prefix=$DESTDIR/usr.
+
+However --prefix=$DESTDIR/usr adds $DESTDIR into
+its cmake config. This patch strips $DESTDIR out
+of cmake config
 --- a/tools/boost_install/boost-install.jam
 +++ b/tools/boost_install/boost-install.jam
 @@ -678,6 +678,16 @@ local rule path-native-fwd ( path )