tree 66e6390b5ba12980c34e2a4bbc1ea7788d458b81
parent 9f4d9c6a443ff0b6f847f0d0e1054cd140aeb7d5
author zhangkun83 <zhangkun@google.com> 1427738522 -0700
committer zhangkun83 <zhangkun@google.com> 1427738522 -0700

Clarify system requirements