diff --git a/README.md b/README.md
index adb1a16..1985277 100644
--- a/README.md
+++ b/README.md
@@ -97,6 +97,8 @@ def project do
 end
 ```
 
+If you need, then you can add `summary: true` to print summary on the standard output. Useful in CI tools that can extract total coverage from there.
+
 ## Screenshots
 
 ![Screenshot1](screenshots/shot1.png)
diff --git a/include/covertool.hrl b/include/covertool.hrl
index c82a059..50ee5c6 100644
--- a/include/covertool.hrl
+++ b/include/covertool.hrl
@@ -2,5 +2,6 @@
                  prefix_len = 0,
                  cover_data = no_import,
                  output = "coverage.xml",
+                 summary = false,
                  sources = ["src/"],
                  beams = ["ebin/"]}).
diff --git a/src/covertool.erl b/src/covertool.erl
index 12597bc..2b30479 100644
--- a/src/covertool.erl
+++ b/src/covertool.erl
@@ -18,8 +18,6 @@
 -include("covertool.hrl").
 -include_lib("xmerl/include/xmerl.hrl").
 
--define(EUNIT_DIR, ".eunit").
-
 -record(result, {line = {0, 0},
                  branches = {0, 0},
                  data = []}).
@@ -137,6 +135,15 @@ generate_report(Config, Modules) ->
              {packages, Result#result.data}]},
     Report = xmerl:export_simple([Root], xmerl_xml, [{prolog, Prolog}]),
     write_output(Report, Output),
+    if
+        Config#config.summary ->
+            io:format("Line total: ~s~nBranch total: ~s~n", [
+                                                             percentage(Result#result.line),
+                                                             percentage(Result#result.branches)
+                                                            ]);
+        true ->
+            ok
+    end,
     ok.
 
 generate_packages(AppName, PrefixLen, Modules) ->
@@ -202,7 +209,7 @@ generate_classes(Modules) ->
                   Class = generate_class(Module),
                   {Class#result.data, sum(Result, Class)}
           end,
-    
+
     % Skip modules without sources
     Filter = fun(Module) ->
                      case lookup_source(Module) of
@@ -224,10 +231,11 @@ generate_class(Module) ->
                           []},
                   {Data, Result#result{line = LineCoverage}}
           end,
-    {ok, Lines} = cover:analyse(Module, calls, line),
+    {ok, Lines0} = cover:analyse(Module, calls, line),
+    Lines = dedup(Lines0),
 
-    % XXX: ignore zero-indexed line, for some reason it is always present and always not hit
-    Filter = fun({{_Module, 0}, 0}) -> false;
+    % ignore zero-indexed lines, these are lines for generated code
+    Filter = fun({{_Module, 0}, _}) -> false;
                 (_Other) -> true
              end,
     Lines2 = lists:filter(Filter, Lines),
@@ -289,6 +297,10 @@ sum({Covered1, Valid1}, {Covered2, Valid2}) ->
 rate({_Covered, 0}) -> "0.0";
 rate({Covered, Valid}) -> float_to_list(Covered / Valid, [{decimals, 3}, compact]).
 
+percentage({_Covered, 0}) -> "100.0%";
+percentage({Covered, Valid}) ->
+    float_to_list(100 * Covered / Valid, [{decimals, 1}, compact]) ++ "%".
+
 % lookup source in source directory
 lookup_source(Module) ->
     lookup_source(get(ebin), Module).
@@ -356,3 +368,10 @@ function_lines(MFA, LinesData) ->
                      Line = proplists:get_value(number, element(2, LineData)),
                      Line > Start andalso Line =< End
                  end, LinesData).
+
+dedup(List) -> dedup(lists:sort(List), []).
+
+dedup([], Agg) -> lists:reverse(Agg);
+dedup([{Pos, C1}, {Pos, C2} | Rest], Agg) ->
+    dedup([{Pos, C1 + C2} | Rest], Agg);
+dedup([Entry | Rest], Agg) -> dedup(Rest, [Entry | Agg]).
diff --git a/src/mix_covertool.erl b/src/mix_covertool.erl
index c32137d..5cb4626 100644
--- a/src/mix_covertool.erl
+++ b/src/mix_covertool.erl
@@ -8,7 +8,7 @@
 %% ===================================================================
 %% Mix plugin callbacks
 %% ===================================================================
-start( CompilePath, _Opts ) ->
+start( CompilePath, Opts ) ->
     _ = cover:start(),
 
     case cover:compile_beam_directory(binary:bin_to_list(CompilePath)) of
@@ -21,7 +21,9 @@ start( CompilePath, _Opts ) ->
     AppName = proplists:get_value(app, mix_project(config)),
     {ok, SrcDir} = file:get_cwd(),
     BeamDir = binary:bin_to_list(mix_project(compile_path)),
-    Config = #config{appname = AppName, sources = [SrcDir], beams = [BeamDir]},
+    Summary = proplists:get_bool(summary, Opts),
+    Config = #config{appname = AppName, sources = [SrcDir], beams = [BeamDir],
+                     summary = Summary},
 
     fun() ->
         covertool:generate_report(Config, cover:modules())
diff --git a/src/rebar3_covertool_gen.erl b/src/rebar3_covertool_gen.erl
index 4b59f74..2b25b53 100644
--- a/src/rebar3_covertool_gen.erl
+++ b/src/rebar3_covertool_gen.erl
@@ -25,7 +25,7 @@ init( State ) ->
     NewState = rebar_state:add_provider(State, providers:create(Options)),
     {ok, NewState}.
 
-    
+
 do(State) ->
     OutputFiles = output_files(State),
     InputFiles = input_files(State),
@@ -98,7 +98,7 @@ get_apps(State) ->
     ProjectApps = [app_to_atom(rebar_app_info:name(PA))
                    || PA <- rebar_state:project_apps(State)],
     IncludeApps = include_apps(State),
-    lists:usort(ProjectApps ++ IncludeApps).      
+    lists:usort(ProjectApps ++ IncludeApps).
 
 generate_apps( State, Apps, LogFile ) ->
     Result = lists:foldl( fun(App, Result) -> generate_app(State, App, Result) end, ok, Apps ),
@@ -167,7 +167,8 @@ coverdata_files(State) ->
 
 covertool_opts(_State) ->
     [{include_apps, $a, "include_apps", string, help(include_apps)},
-     {prefix_len, $p, "prefix_len", integer, help(prefix_len)}].
+     {prefix_len, $p, "prefix_len", integer, help(prefix_len)},
+     {summary, $s, "summary", boolean, help(summary)}].
 
 help(include_apps) ->
     "A CSV of OTP app dependencies to include in covertool output. "
@@ -177,7 +178,10 @@ help(prefix_len) ->
     "[Optional] include the first N sections of the '_'-delimited module name in "
     "the package name. For example, with a prefix_len of 2 and a module named "
     "'app0_worker_srv_sup', the term 'app0.worker' would be added to the end of "
-    "the package name. Default: 0".
+    "the package name. Default: 0";
+help(summary) ->
+    "Print summary of the results to the standard output. "
+    "Useful for CI jobs. Default: false".
 
 app_to_atom(A) when is_atom(A) -> A;
 app_to_atom(S) when is_list(S) -> list_to_atom(S);
diff --git a/src/rebar_covertool.erl b/src/rebar_covertool.erl
index f7d7e5c..6bf7ca3 100644
--- a/src/rebar_covertool.erl
+++ b/src/rebar_covertool.erl
@@ -58,8 +58,10 @@ rebar2_generate(Config, AppFile, ConfigKey) ->
                 {ok, CoverLog} ->
                     cover:import(From),
                     PrefixLen = rebar_config:get_local(Config, covertool_prefix_len, 0),
+                    Summary = rebar_config:get_local(Config, covertool_summary, false),
                     CoverConfig = #config{appname = AppName,
                                           prefix_len = PrefixLen,
+                                          summary = Summary,
                                           output = To},
                     covertool:generate_report(CoverConfig,
                                               cover:imported_modules()),