how to add make a line-through in jekyll?

Question

i'd like to add a line-throught in my post, and i try like this:

~~hello,world~~

it's ok in my Mou(a software display markdown content), but it doesn't work in jekyll ,it tell me

REXML could not parse this XML/HTML:

i'm new to markdown, someone know that's why and how to fix it? thanks~