I lost my commit signature

From: ZhenTian <loooseleaves@gmail.com>
Date: Jun 14, 2016, 07:50 UTC
Message-ID: <CAGrdoOrrpc7OiU74fa-qpjLNxOtm4upAOAfWPG6VbWUjyE0C2Q@mail.gmail.com>

Hi git developers,

I commit with -S argument, and I got some output like this:

You need a passphrase to unlock the secret key for user: "Tian Zhen <tianzhen@honovation.com>" 4096-bit RSA key, ID 2EF2AD6E, created 2016-05-21

[master d107770] feat: mobile support free freight hint, closed #1417
 8 files changed, 58 insertions(+), 29 deletions(-)
 rewrite static/css/mobile.min.css (64%)

but when I check git log with --show-signature, I can't find my sign.

my git is 2.4.8, and OS is Ubuntu 14.04.4

Sincerely, dawncold

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