diff --git a/README.md b/README.md
index 6537aaa..136f54a 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,6 @@ when needed.
 2. Create a [personal GitLab access token](https://docs.gitlab.com/ee/user/profile/personal_access_tokens.html#creating-a-personal-access-token) with the `read_api` scope.
 
 ## Installation
-
 ```
 $ npm install -g gitlab-search
 ```
@@ -39,11 +38,12 @@ $ gitlab-search [options] [command] <search-term>
 Options:
   -V, --version                            output the version number
   -g, --groups <group-names>               group(s) to find repositories in (separated with comma)
+  -r, --recursive                          Search recursively in projects in the given groups
   -f, --filename <filename>                only search for contents in given a file, glob matching with wildcards (*)
   -e, --extension <file-extension>         only search for contents in files with given extension
   -p, --path <path>                        only search in files in the given path
-  -a, --archive [all,only,exclude]         search only in archived projects, exclude archived projects, search in all projects (default is all)
-  -h, --help                               output usage information
+  -a, --archive [all,only,exclude]         to only search on archived repositories, or to exclude them, by default the search will be apply to all repositories (default: "all")
+  -h, --help                               display help for command
 
 Commands:
   setup [options] <personal-access-token>  create configuration file
@@ -86,6 +86,18 @@ Requesting: GET https://gitlab.com/api/v4/projects/666/search?scope=blobs&search
 Requesting: GET https://gitlab.com/api/v4/projects/999/search?scope=blobs&search=here-is-my-search-term
 ```
 
+## Installing from source
+1. Install node 14.x
+2. Clone this repository
+3. Build with
+   ```sh
+   $ npm run build
+   ```
+4. Run from bin directory
+   ```sh
+   $ bin/gitlab-search.js -h
+   ```
+
 ## License
 
 MIT
diff --git a/src/GitLab.re b/src/GitLab.re
index 858b0cc..9dcd94b 100644
--- a/src/GitLab.re
+++ b/src/GitLab.re
@@ -227,7 +227,12 @@ let fetchGroups = (groupsNames: option(string)) => {
 };
 
 // https://docs.gitlab.com/ee/api/groups.html#list-a-groups-projects
-let fetchProjectsInGroups = (archiveArgument: option(string), groups: array(group)) => {
+let fetchProjectsInGroups = (archiveArgument: option(string), isRecursive: option(string), groups: array(group)) => {
+  let recursiveParam = switch (isRecursive) {
+    | None => "";
+    | _ => "&include_subgroups=true";
+  };
+  
   let archiveQueryParam = switch (archiveArgument) {
     | Some("only") => "&archived=true";
     | Some("exclude") => "&archived=false";
@@ -241,7 +246,7 @@ let fetchProjectsInGroups = (archiveArgument: option(string), groups: array(grou
       // explicit information about the incoming function argument is a list of groups
       (group: group) =>
       paginatedRequest(
-        RelativeUrl("/groups/" ++ group.id ++ "/projects?per_page=100" ++ archiveQueryParam),
+        RelativeUrl("/groups/" ++ group.id ++ "/projects?per_page=100" ++ archiveQueryParam ++ recursiveParam),
         Decode.projects,
       )
     );
diff --git a/src/Main.re b/src/Main.re
index 7e70259..8006150 100644
--- a/src/Main.re
+++ b/src/Main.re
@@ -19,7 +19,7 @@ let main = (args, options) => {
 
   Js.Promise.(
     GitLab.fetchGroups(groups)
-    |> then_(GitLab.fetchProjectsInGroups(getOption("archive")))
+    |> then_(GitLab.fetchProjectsInGroups(getOption("archive"), getOption("recursive")))
     |> then_(GitLab.searchInProjects(criterias))
     |> then_(results =>
          resolve(Print.searchResults(criterias.term, results))
@@ -63,6 +63,7 @@ Commander.(
        "-g, --groups <group-names>",
        "group(s) to find repositories in (separated with comma)",
      )
+  |> option("-r, --recursive", "Search recursively in projects in the given groups")
   |> option(
        "-f, --filename <filename>",
        "only search for contents in given a file, glob matching with wildcards (*)",