Add document for #361 (#346).
Add document for #361 (#346).

cocoatomo/asakusafw,asakusafw/asakusafw,asakusafw/asakusafw,ashigeru/asakusafw,akirakw/asakusafw,akirakw/asakusafw,cocoatomo/asakusafw,ashigeru/asakusafw