diff --git a/bin/git-summary b/bin/git-summary
index 003019d..4acb19e 100755
--- a/bin/git-summary
+++ b/bin/git-summary
@@ -156,14 +156,18 @@ single_file() {
 # list the author for all file
 #
 lines() {
-  git ls-files | single_file
+  if [ -n "$1" ]; then
+    git ls-files -- $1 | single_file
+  else
+    git ls-files | single_file
+  fi
 }
 
 #
 # get the number of the lines
 #
 line_count() {
-  lines | wc -l
+  lines $1 | wc -l
 }
 
 # summary
@@ -172,9 +176,9 @@ echo
 echo " project  : $project"
 
 if [ -n "$SUMMARY_BY_LINE" ]; then
-  echo " lines    : $(line_count)"
+  echo " lines    : $(line_count $commit)"
   echo " authors  :"
-  lines | sort | uniq -c | sort -rn | format_authors
+  lines $commit | sort | uniq -c | sort -rn | format_authors
 else
 
   # shellcheck disable=SC2046
diff --git a/man/git-summary.1 b/man/git-summary.1
index 9be6b61..83e0ed5 100644
--- a/man/git-summary.1
+++ b/man/git-summary.1
@@ -1,13 +1,13 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "GIT\-SUMMARY" "1" "August 2020" "" "Git Extras"
+.TH "GIT\-SUMMARY" "1" "July 2021" "" "Git Extras"
 .
 .SH "NAME"
 \fBgit\-summary\fR \- Show repository summary
 .
 .SH "SYNOPSIS"
-\fBgit\-summary\fR [\-\-line] [\-\-dedup\-by\-email] [<committish>]
+\fBgit\-summary\fR [\-\-line] [\-\-dedup\-by\-email] [<committish or path>]
 .
 .SH "DESCRIPTION"
 Shows a summary of the repository\.
@@ -19,6 +19,12 @@ Shows a summary of the repository\.
 Summarize only the range of commits included in the <committish>\.
 .
 .P
+<path>
+.
+.P
+Summarize only the range of files included in the <path>\.
+.
+.P
 \-\-dedup\-by\-email
 .
 .P
@@ -48,7 +54,7 @@ This option can not be used together with \fB\-\-line\fR\.
 \-\-line
 .
 .P
-Summarize with lines other than commits\. Any <committish> is ignored when \-\-line is specified\.
+Summarize with lines other than commits\. When \fB\-\-line\fR is specified, the last argument is treated as <path>\.
 .
 .SH "EXAMPLES"
 Outputs a repo summary:
@@ -120,7 +126,22 @@ authors  :
 .IP "" 0
 .
 .P
-The committish is ignored when \-\-line is specified\.
+Filter with the path:
+.
+.IP "" 4
+.
+.nf
+
+$ git summary \-\-line bin/
+
+project  : git\-extras
+lines    : 4420
+authors  :
+  \.\.\.
+.
+.fi
+.
+.IP "" 0
 .
 .SH "AUTHOR"
 Written by Tj Holowaychuk <\fItj@vision\-media\.ca\fR>
diff --git a/man/git-summary.html b/man/git-summary.html
index dbfcd1b..41bfe90 100644
--- a/man/git-summary.html
+++ b/man/git-summary.html
@@ -76,7 +76,7 @@
 
 <h2 id="SYNOPSIS">SYNOPSIS</h2>
 
-<p><code>git-summary</code> [--line] [--dedup-by-email] [&lt;committish&gt;]</p>
+<p><code>git-summary</code> [--line] [--dedup-by-email] [&lt;committish or path&gt;]</p>
 
 <h2 id="DESCRIPTION">DESCRIPTION</h2>
 
@@ -88,6 +88,10 @@
 
 <p>  Summarize only the range of commits included in the &lt;committish&gt;.</p>
 
+<p>  &lt;path&gt;</p>
+
+<p>  Summarize only the range of files included in the &lt;path&gt;.</p>
+
 <p>  --dedup-by-email</p>
 
 <p>  Remove duplicate authors who belong to the same email address.
@@ -108,7 +112,7 @@ $ git summary --dedup-by-email
 <p>  --line</p>
 
 <p>  Summarize with lines other than commits.
-  Any &lt;committish&gt; is ignored when --line is specified.</p>
+  When <code>--line</code> is specified, the last argument is treated as &lt;path&gt;.</p>
 
 <h2 id="EXAMPLES">EXAMPLES</h2>
 
@@ -158,11 +162,19 @@ authors  :
   ...
 </code></pre>
 
-<p>  The committish is ignored when --line is specified.</p>
+<p>  Filter with the path:</p>
+
+<pre><code>$ git summary --line bin/
+
+project  : git-extras
+lines    : 4420
+authors  :
+  ...
+</code></pre>
 
 <h2 id="AUTHOR">AUTHOR</h2>
 
-<p>Written by Tj Holowaychuk &lt;<a href="&#109;&#97;&#105;&#108;&#x74;&#x6f;&#58;&#116;&#106;&#x40;&#x76;&#x69;&#x73;&#x69;&#x6f;&#110;&#x2d;&#x6d;&#101;&#x64;&#105;&#x61;&#x2e;&#99;&#97;" data-bare-link="true">&#x74;&#106;&#x40;&#118;&#x69;&#x73;&#105;&#x6f;&#x6e;&#45;&#x6d;&#x65;&#x64;&#x69;&#x61;&#46;&#99;&#97;</a>&gt;</p>
+<p>Written by Tj Holowaychuk &lt;<a href="&#109;&#x61;&#105;&#x6c;&#116;&#x6f;&#x3a;&#116;&#x6a;&#x40;&#118;&#x69;&#x73;&#x69;&#x6f;&#110;&#x2d;&#109;&#101;&#100;&#x69;&#97;&#x2e;&#99;&#x61;" data-bare-link="true">&#116;&#106;&#x40;&#x76;&#105;&#115;&#105;&#111;&#110;&#x2d;&#109;&#101;&#100;&#105;&#x61;&#x2e;&#99;&#97;</a>&gt;</p>
 
 <h2 id="REPORTING-BUGS">REPORTING BUGS</h2>
 
@@ -175,7 +187,7 @@ authors  :
 
   <ol class='man-decor man-foot man foot'>
     <li class='tl'></li>
-    <li class='tc'>August 2020</li>
+    <li class='tc'>July 2021</li>
     <li class='tr'>git-summary(1)</li>
   </ol>
 
diff --git a/man/git-summary.md b/man/git-summary.md
index a134aab..e81366d 100644
--- a/man/git-summary.md
+++ b/man/git-summary.md
@@ -3,7 +3,7 @@ git-summary(1) -- Show repository summary
 
 ## SYNOPSIS
 
-`git-summary` [--line] [--dedup-by-email] [&lt;committish&gt;]
+`git-summary` [--line] [--dedup-by-email] [&lt;committish or path&gt;]
 
 ## DESCRIPTION
 
@@ -15,6 +15,10 @@ Shows a summary of the repository.
 
   Summarize only the range of commits included in the &lt;committish&gt;.
 
+  &lt;path&gt;
+
+  Summarize only the range of files included in the &lt;path&gt;.
+
   --dedup-by-email
 
   Remove duplicate authors who belong to the same email address.
@@ -34,7 +38,7 @@ Shows a summary of the repository.
   --line
 
   Summarize with lines other than commits.
-  Any &lt;committish&gt; is ignored when --line is specified.
+  When `--line` is specified, the last argument is treated as &lt;path&gt;.
 
 ## EXAMPLES
 
@@ -81,7 +85,14 @@ Shows a summary of the repository.
     authors  :
       ...
 
-  The committish is ignored when --line is specified.
+  Filter with the path:
+
+    $ git summary --line bin/
+
+    project  : git-extras
+    lines    : 4420
+    authors  :
+      ...
 
 ## AUTHOR