diff --git a/README.md b/README.md
index 83336177e..241e16e72 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,8 @@ It browses the repository and outputs html page with statistics.
       s, [--silent], [--no-silent]  # Silent mode. Don't output anything.
       d, [--tree=TREE]              # Tree where statistics should be generated.
                                     # Default: .
+      c, [--comment=COMMENT]        # The string which is used for comments.
+                                    # Default: ///
 
 
 
diff --git a/config/locales/de.yml b/config/locales/de.yml
index b651fec25..59ae1ca1b 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -12,8 +12,10 @@ de:
   commits_by_hour: Commits in der Stunde
   files: Dateien
   lines: Zeilen
+  comments: Kommentare
   files_by_date: Dateien nach Datum
   lines_by_date: Zeilen nach Datum
+  comments_by_date: Kommentare nach Datum
   files_by_extension: Dateien nach Erweiterungen
   lines_by_extension: Zeilen nach Erweiterungen
   hour_of_day: Tagesstunden
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 5b86ac490..e87850a06 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -13,8 +13,10 @@ en:
   commits_by_hour: Commits by hour
   files: Files
   lines: Lines
+  comments: Comments
   files_by_date: Files by date
   lines_by_date: Lines by date
+  comments_by_date: Comments by date
   files_by_extension: Files by extension
   lines_by_extension: Lines by extension
   hour_of_day: Hour of day
diff --git a/lib/git_stats/base.rb b/lib/git_stats/base.rb
index cdec51f05..3293c1166 100644
--- a/lib/git_stats/base.rb
+++ b/lib/git_stats/base.rb
@@ -18,6 +18,7 @@ require 'git_stats/git_data/command_runner'
 require 'git_stats/git_data/commit'
 require 'git_stats/git_data/repo'
 require 'git_stats/git_data/short_stat'
+require 'git_stats/git_data/comment_stat'
 require 'git_stats/git_data/tree'
 
 require 'git_stats/stats_view/template'
diff --git a/lib/git_stats/cli.rb b/lib/git_stats/cli.rb
index ac317c6f9..bff4b5122 100644
--- a/lib/git_stats/cli.rb
+++ b/lib/git_stats/cli.rb
@@ -10,11 +10,12 @@ class GitStats::CLI < Thor
   option :to, :aliases => :t, :default => 'HEAD', :desc => 'Commit where statistics should stop.'
   option :silent, :aliases => :s, :type => :boolean, :desc => 'Silent mode. Don\'t output anything.'
   option :tree, :aliases => :d, :default => '.', :desc => 'Tree where statistics should be generated.'
-
+  option :comment, :aliases => :c, :default => '///', :desc => 'The string which is used for comments.'
+  
   desc 'generate', 'Generates the statistics of a repository'
   def generate
     I18n.locale = options[:language]
-    GitStats::Generator.new(options[:path], options[:output], options[:from], options[:to], options[:tree]) { |g|
+    GitStats::Generator.new(options[:path], options[:output], options[:from], options[:to], options[:tree], options[:comment]) { |g|
       g.add_command_observer { |command, result| puts "#{command}" } unless options[:silent]
     }.render_all
   end
diff --git a/lib/git_stats/generator.rb b/lib/git_stats/generator.rb
index b3a87f03f..ec6949baa 100644
--- a/lib/git_stats/generator.rb
+++ b/lib/git_stats/generator.rb
@@ -4,10 +4,10 @@ module GitStats
     delegate :add_command_observer, to: :@repo
     delegate :render_all, to: :@view
 
-    def initialize(repo_path, out_path, first_commit_sha = nil, last_commit_sha = "HEAD", tree_path = ".")
+    def initialize(repo_path, out_path, first_commit_sha = nil, last_commit_sha = "HEAD", tree_path = ".", comment_string = "///")
       validate_repo_path(repo_path)
 
-      @repo = GitData::Repo.new(path: repo_path, first_commit_sha: first_commit_sha, last_commit_sha: last_commit_sha, tree_path: tree_path)
+      @repo = GitData::Repo.new(path: repo_path, first_commit_sha: first_commit_sha, last_commit_sha: last_commit_sha, tree_path: tree_path, comment_string: comment_string)
       view_data = StatsView::ViewData.new(@repo)
       @view = StatsView::View.new(view_data, out_path)
 
diff --git a/lib/git_stats/git_data/comment_stat.rb b/lib/git_stats/git_data/comment_stat.rb
new file mode 100644
index 000000000..0e2df709b
--- /dev/null
+++ b/lib/git_stats/git_data/comment_stat.rb
@@ -0,0 +1,38 @@
+# -*- encoding : utf-8 -*-
+module GitStats
+  module GitData
+    class CommentStat
+      attr_reader :commit, :insertions, :deletions
+
+      def initialize(commit)
+        @commit = commit
+        calculate_stat
+      end
+
+      def changed_lines
+        insertions + deletions
+      end
+
+      def to_s
+        "#{self.class} #@commit"
+      end
+
+      def escape_characters_in_string(string)
+      	pattern = /(\'|\"|\.|\*|\/|\-|\\)/
+      	string.gsub(pattern){|match|"\\"  + match}
+      end
+      
+      private
+      def calculate_stat
+        escaped_string = escape_characters_in_string(commit.repo.comment_string)
+        stat_line = commit.repo.run("git show #{commit.sha} | awk 'BEGIN {adds=0; dels=0} {if ($0 ~ /^\\+#{escaped_string}/) adds++; if ($0 ~ /^\-#{escaped_string}/) dels++} END {print adds \" insertions \" dels \" deletes\"}'").lines.to_a[0]
+        if stat_line.blank?
+          @insertions = @deletions = 0
+        else
+          @insertions = stat_line[/(\d+) insertions?/, 1].to_i
+          @deletions = stat_line[/(\d+) deletes?/, 1].to_i
+        end
+      end
+    end
+  end
+end
diff --git a/lib/git_stats/git_data/commit.rb b/lib/git_stats/git_data/commit.rb
index d8c6ee2db..0b574abd7 100644
--- a/lib/git_stats/git_data/commit.rb
+++ b/lib/git_stats/git_data/commit.rb
@@ -50,6 +50,10 @@ module GitStats
         @short_stat ||= ShortStat.new(self)
       end
 
+      def comment_stat
+        @comment_stat ||= CommentStat.new(self)
+      end
+
       def to_s
         "#{self.class} #@sha"
       end
diff --git a/lib/git_stats/git_data/repo.rb b/lib/git_stats/git_data/repo.rb
index cf6011c89..e57aba9fa 100644
--- a/lib/git_stats/git_data/repo.rb
+++ b/lib/git_stats/git_data/repo.rb
@@ -6,10 +6,10 @@ module GitStats
     class Repo
       include HashInitializable
 
-      attr_reader :path, :first_commit_sha, :last_commit_sha, :tree_path
+      attr_reader :path, :first_commit_sha, :last_commit_sha, :tree_path, :comment_string
 
       delegate :files, :files_by_extension, :files_by_extension_count, :lines_by_extension,
-               :files_count, :binary_files, :text_files, :lines_count, to: :last_commit
+               :files_count, :binary_files, :text_files, :lines_count, :comments_count, to: :last_commit
 
       def initialize(params)
         super(params)
@@ -64,6 +64,15 @@ module GitStats
         }]
       end
 
+      def comments_count_by_date
+        sum = 0
+        @comment_count_each_day ||= Hash[commits.map { |commit|
+          sum += commit.comment_stat.insertions
+          sum -= commit.comment_stat.deletions
+          [commit.date.to_date, sum]
+        }].fill_empty_days!(aggregated: true)
+      end
+
       def last_commit
         commits.last
       end
@@ -80,6 +89,10 @@ module GitStats
         @short_stats ||= commits.map(&:short_stat)
       end
 
+      def comment_stats
+        @comment_stats ||= commits.map(&:comment_stat)
+      end
+
       def activity
         @activity ||= Activity.new(commits)
       end
diff --git a/lib/git_stats/stats_view/charts/charts.rb b/lib/git_stats/stats_view/charts/charts.rb
index ce3184b87..5b94c0337 100644
--- a/lib/git_stats/stats_view/charts/charts.rb
+++ b/lib/git_stats/stats_view/charts/charts.rb
@@ -3,7 +3,7 @@ module GitStats
   module StatsView
     module Charts
       class All
-        delegate :files_by_extension, :lines_by_extension, :files_by_date, :lines_by_date, to: :repo_charts
+        delegate :files_by_extension, :lines_by_extension, :files_by_date, :lines_by_date, :comments_by_date, to: :repo_charts
 
         delegate :commits_sum_by_author_by_date, :changed_lines_by_author_by_date,
                  :insertions_by_author_by_date, :deletions_by_author_by_date, to: :authors_charts
diff --git a/lib/git_stats/stats_view/charts/repo_charts.rb b/lib/git_stats/stats_view/charts/repo_charts.rb
index a761cb159..3b6172259 100644
--- a/lib/git_stats/stats_view/charts/repo_charts.rb
+++ b/lib/git_stats/stats_view/charts/repo_charts.rb
@@ -47,6 +47,16 @@ module GitStats
           end
         end
 
+        def comments_by_date
+          Chart.new do |f|
+            f.date_chart(
+                data: @repo.comments_count_by_date,
+                title: :comments_by_date.t,
+                y_text: :comments.t
+            )
+          end
+        end
+
       end
     end
   end
diff --git a/lib/git_stats/stats_view/view.rb b/lib/git_stats/stats_view/view.rb
index 42e216ba2..d99dd0050 100644
--- a/lib/git_stats/stats_view/view.rb
+++ b/lib/git_stats/stats_view/view.rb
@@ -55,7 +55,8 @@ module GitStats
             activity: 'activity/by_date.html',
             authors: 'authors/best_authors.html',
             files: 'files/by_date.html',
-            lines: 'lines/by_date.html'
+            lines: 'lines/by_date.html',
+            comments: 'comments/by_date.html'
         }
       end
 
diff --git a/spec/git_data/generator_spec.rb b/spec/git_data/generator_spec.rb
index 7d1440c96..a04b97a4d 100644
--- a/spec/git_data/generator_spec.rb
+++ b/spec/git_data/generator_spec.rb
@@ -15,7 +15,7 @@ describe GitStats::Generator do
 
   it 'should pass command observer to repo' do
     repo = double('repo')
-    GitStats::GitData::Repo.should_receive(:new).with(path: repo_path, first_commit_sha: nil, last_commit_sha: "HEAD", tree_path: ".").and_return(repo)
+    GitStats::GitData::Repo.should_receive(:new).with(path: repo_path, first_commit_sha: nil, last_commit_sha: "HEAD", tree_path: ".", :comment_string=>"///").and_return(repo)
 
     generator = GitStats::Generator.new(repo_path, out_path)
 
@@ -27,7 +27,7 @@ describe GitStats::Generator do
 
   it 'should render all templates with view data for this repo' do
     repo = double('repo')
-    GitStats::GitData::Repo.should_receive(:new).with(path: repo_path, first_commit_sha: nil, last_commit_sha: "HEAD", tree_path: ".").and_return(repo)
+    GitStats::GitData::Repo.should_receive(:new).with(path: repo_path, first_commit_sha: nil, last_commit_sha: "HEAD", tree_path: ".", :comment_string=>"///").and_return(repo)
 
     view_data = double('view_data')
     GitStats::StatsView::ViewData.should_receive(:new).with(repo).and_return(view_data)
diff --git a/templates/comments/_comments.haml b/templates/comments/_comments.haml
new file mode 100644
index 000000000..766507e71
--- /dev/null
+++ b/templates/comments/_comments.haml
@@ -0,0 +1,11 @@
+.tabbable.tabs-left
+  %ul.nav.nav-tabs
+    %li{class: page == :comments_by_date ? "active" : ""}
+      %a{:href => 'by_date.html'}= :comments_by_date.t
+
+  .tab-content
+    .tab-pane.active
+      .page-header
+        %h1.pagination-centered= page.t
+      - if page == :comments_by_date
+        = high_stock("comments_by_date", charts.comments_by_date)
diff --git a/templates/comments/by_date.haml b/templates/comments/by_date.haml
new file mode 100644
index 000000000..7305abcb1
--- /dev/null
+++ b/templates/comments/by_date.haml
@@ -0,0 +1 @@
+= render_partial('comments/_comments', page: :comments_by_date)
\ No newline at end of file