diff --git a/bin/git-sync b/bin/git-sync
index 49fe98f..682c286 100755
--- a/bin/git-sync
+++ b/bin/git-sync
@@ -7,10 +7,11 @@ function _usage()
 Usage:
   ${command} [<remote> <branch>]
   ${command} -h | --help
+  ${command} -s | --soft
 
 Sync local branch with <remote>/<branch>.
 When <remote> and <branch> are not specified on the command line, upstream of local branch will be used by default.
-All changes and untracked files and directories will be removed.
+All changes and untracked files and directories will be removed unless you add -s(--soft).
 
 Examples:
   Sync with upstream of local branch:
@@ -18,6 +19,9 @@ Examples:
 
   Sync with origin/master:
     ${command} origin master
+
+  Sync without cleaning untracked files:
+    ${command} -s
 EOS
 }
 
@@ -29,6 +33,9 @@ function main()
         _usage
         exit
         ;;
+      -s | --soft)
+        local soft="true"
+        ;;
       * )
         if [ "${remote}" = "" ]; then
           local remote="$1"
@@ -65,7 +72,11 @@ function main()
   read res
   case "${res}" in
     "Y" | "y" | "yes" | "Yes" | "YES" )
-      git fetch "${remote}" "${branch}" && git reset --hard "${remote_branch}" && git clean -d -f -x
+      if [ "${soft}" = "true" ]; then
+        git fetch "${remote}" "${branch}" && git reset --hard "${remote_branch}"
+      else
+        git fetch "${remote}" "${branch}" && git reset --hard "${remote_branch}" && git clean -d -f -x
+      fi
       ;;
     * )
       echo "Canceled."
diff --git a/man/git-sync.1 b/man/git-sync.1
index 30ec48e..67c5981 100644
--- a/man/git-sync.1
+++ b/man/git-sync.1
@@ -1,13 +1,13 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "GIT\-SYNC" "1" "October 2017" "" "Git Extras"
+.TH "GIT\-SYNC" "1" "January 2019" "" ""
 .
 .SH "NAME"
 \fBgit\-sync\fR \- Sync local branch with remote branch
 .
 .SH "SYNOPSIS"
-\fBgit sync\fR [ <remote> <branch> ]
+\fBgit sync\fR [\-\-soft] [ <remote> <branch> ]
 .
 .SH "DESCRIPTION"
 Sync local branch with <remote>/<branch>\.
@@ -16,7 +16,13 @@ Sync local branch with <remote>/<branch>\.
 When <remote> and <branch> are not specified on the command line, upstream of local branch will be used by default\.
 .
 .P
-All changes and untracked files and directories will be removed\.
+All changes and untracked files and directories will be removed unless you add \-s(\-\-soft)\.
+.
+.SH "OPTIONS"
+\-\-soft or \-s
+.
+.P
+Add this flag if you want to preserve untracked files\.
 .
 .SH "EXAMPLES"
 Sync local branch with its upstream
@@ -44,6 +50,19 @@ $ git sync origin master
 .
 .IP "" 0
 .
+.P
+Sync without cleaning untracked files:
+.
+.IP "" 4
+.
+.nf
+
+$ git sync \-s origin master
+.
+.fi
+.
+.IP "" 0
+.
 .SH "AUTHOR"
 Written by Takuma Yamaguchi <\fIkumon0587@gmail\.com\fR>
 .
diff --git a/man/git-sync.html b/man/git-sync.html
index ab00335..f4ad81f 100644
--- a/man/git-sync.html
+++ b/man/git-sync.html
@@ -56,6 +56,7 @@
     <a href="#NAME">NAME</a>
     <a href="#SYNOPSIS">SYNOPSIS</a>
     <a href="#DESCRIPTION">DESCRIPTION</a>
+    <a href="#OPTIONS">OPTIONS</a>
     <a href="#EXAMPLES">EXAMPLES</a>
     <a href="#AUTHOR">AUTHOR</a>
     <a href="#REPORTING-BUGS">REPORTING BUGS</a>
@@ -75,7 +76,7 @@
 
 <h2 id="SYNOPSIS">SYNOPSIS</h2>
 
-<p>  <code>git sync</code> [ &lt;remote&gt; &lt;branch&gt; ]</p>
+<p>  <code>git sync</code> [--soft] [ &lt;remote&gt; &lt;branch&gt; ]</p>
 
 <h2 id="DESCRIPTION">DESCRIPTION</h2>
 
@@ -83,7 +84,13 @@
 
 <p>  When &lt;remote&gt; and &lt;branch&gt; are not specified on the command line, upstream of local branch will be used by default.</p>
 
-<p>  All changes and untracked files and directories will be removed.</p>
+<p>  All changes and untracked files and directories will be removed unless you add -s(--soft).</p>
+
+<h2 id="OPTIONS">OPTIONS</h2>
+
+<p>  --soft or -s</p>
+
+<p>  Add this flag if you want to preserve untracked files.</p>
 
 <h2 id="EXAMPLES">EXAMPLES</h2>
 
@@ -97,9 +104,14 @@
 <pre><code>$ git sync origin master
 </code></pre>
 
+<p>  Sync without cleaning untracked files:</p>
+
+<pre><code>$ git sync -s origin master
+</code></pre>
+
 <h2 id="AUTHOR">AUTHOR</h2>
 
-<p>Written by Takuma Yamaguchi &lt;<a href="&#x6d;&#97;&#x69;&#x6c;&#116;&#x6f;&#x3a;&#107;&#x75;&#109;&#x6f;&#x6e;&#x30;&#53;&#56;&#55;&#64;&#x67;&#x6d;&#97;&#105;&#108;&#x2e;&#99;&#111;&#109;" data-bare-link="true">&#107;&#117;&#109;&#x6f;&#110;&#48;&#x35;&#x38;&#x37;&#64;&#103;&#109;&#97;&#105;&#108;&#x2e;&#x63;&#111;&#x6d;</a>&gt;</p>
+<p>Written by Takuma Yamaguchi &lt;<a href="&#x6d;&#x61;&#105;&#108;&#116;&#x6f;&#x3a;&#x6b;&#117;&#109;&#x6f;&#x6e;&#x30;&#53;&#56;&#x37;&#x40;&#x67;&#x6d;&#x61;&#x69;&#x6c;&#x2e;&#99;&#111;&#109;" data-bare-link="true">&#107;&#117;&#109;&#111;&#x6e;&#x30;&#x35;&#x38;&#x37;&#x40;&#x67;&#x6d;&#97;&#x69;&#x6c;&#x2e;&#x63;&#x6f;&#109;</a>&gt;</p>
 
 <h2 id="REPORTING-BUGS">REPORTING BUGS</h2>
 
@@ -112,7 +124,7 @@
 
   <ol class='man-decor man-foot man foot'>
     <li class='tl'></li>
-    <li class='tc'>October 2017</li>
+    <li class='tc'>January 2019</li>
     <li class='tr'>git-sync(1)</li>
   </ol>
 
diff --git a/man/git-sync.md b/man/git-sync.md
index f2f6e43..9854353 100644
--- a/man/git-sync.md
+++ b/man/git-sync.md
@@ -3,7 +3,7 @@ git-sync(1) -- Sync local branch with remote branch
 
 ## SYNOPSIS
 
-  `git sync` [ &lt;remote&gt; &lt;branch&gt; ]
+  `git sync` [--soft] [ &lt;remote&gt; &lt;branch&gt; ]
 
 ## DESCRIPTION
 
@@ -11,7 +11,14 @@ git-sync(1) -- Sync local branch with remote branch
   
   When &lt;remote&gt; and &lt;branch&gt; are not specified on the command line, upstream of local branch will be used by default.
   
-  All changes and untracked files and directories will be removed.
+  All changes and untracked files and directories will be removed unless you add -s(--soft).
+
+## OPTIONS
+
+  --soft or -s
+
+  Add this flag if you want to preserve untracked files.
+
 
 ## EXAMPLES
 
@@ -23,6 +30,10 @@ git-sync(1) -- Sync local branch with remote branch
 
     $ git sync origin master
 
+  Sync without cleaning untracked files:
+
+    $ git sync -s origin master
+
 ## AUTHOR
 
 Written by Takuma Yamaguchi &lt;<kumon0587@gmail.com>&gt;