add comment about patch  [skip ci]
@@ -13,7 +13,7 @@ source:
sha256: {{ sha256 }}
patches:
# Old Clang doesn't have _mm_undefined_ps; use same workaround as for
- # old gcc.
+ # old gcc; https://github.com/rjhogan/Adept-2/issues/7
- _mm_undefined_ps.patch # [osx]
build:
