diff --git a/README.md b/README.md
index 1025260..3b29415 100644
--- a/README.md
+++ b/README.md
@@ -197,3 +197,4 @@ Fork our code, make a new branch, and send a pull request.
 * undo last commit
 * add custom files/directories to .gitignore
 * **introduction scene to Git** (for those new to Git)
+* [switch to previously selected branch](https://github.com/qw3rtman/gg/issues/40)
diff --git a/bin/gg b/bin/gg
index 772a42e..95fd94b 100755
--- a/bin/gg
+++ b/bin/gg
@@ -9,130 +9,133 @@ var cli = require('cli');
 
 cli.parse(null, ['v', 'version', '-v', '--version', 'i', 'init', 'initialize', 'ig', 'ignore', 'cl', 'clone', 'a', 'aa', 'add', 'c', 'ci', 'commit', 'cn', 'commitnoadd', 'p', 'push', 'pl', 'pull', 'f', 'fetch', 'fa', 's', 'status', 'l', 'log', 'b', 'branch', 'ch', 'checkout']);
 
-switch (cli.command) {
-  // Version.
-  case 'v':
-  case 'version':
-  case '-v':
-  case '--version':
-    gg.version();
-    break;
-
-  // Initialize.
-  case 'i':
-  case 'init':
-  case 'initialize':
-    gg.init();
-    break;
-
-  // .gitignores.
-  case 'ig':
-  case 'ignore':
-    var template = cli.args.join('-');
-
-    gg.ignore(template);
-    break;
-
-  // Clone.
-  case 'cl':
-  case 'clone':
-    var repository = cli.args[0];
-
-    if (typeof repository === 'undefined') {
-      repository = '';
-    }
-
-    if (repository.substring(0, 7) === 'http://' || repository.substring(0, 8) === 'https://') { // URL.
-      gg.clone(repository);
-    } else if (repository.indexOf('@') > -1 && repository.indexOf(':') > -1) { // SSH.
-      gg.clone(repository);
-    } else {
-      gg.cloneGitHub(repository);
-    }
-    break;
-
-  // Add.
-  case 'a':
-  case 'add':
-    if (cli.args[1] === '' || typeof cli.args[1] !== 'undefined') {
-      var options = cli.args[0];
-      var target = cli.args[1];
-      gg.addOptions(options, target);
-    } else {
-      var target = cli.args[0];
-      gg.addSingle(target);
-    }
-    break;
-
-  // Add all.
-  case 'aa': // Short for 'add all'.
-    gg.addAll();
-    break;
-
-  // Commit.
-  case 'c':
-  case 'ci':
-  case 'commit':
-    var message = cli.args.join(' ');
-    gg.commit(message, true);
-    break;
-
-  // Commit without adding.
-  case 'cn':
-    var message = cli.args.join(' ');
-    gg.commit(message, false);
-    break;
-
-  // Push.
-  case 'p':
-  case 'push':
-    gg.push();
-    break;
-
-  // Pull.
-  case 'pl':
-  case 'pull':
-    gg.pull();
-    break;
-
-  // Fetch.
-  case 'f':
-  case 'fetch':
-    gg.fetch();
-    break;
-
-  // Fetch all.
-  case 'fa': // Short for 'fetch --all'.
-    gg.fetchAll();
-    break;
-
-  // Status.
-  case 's':
-  case 'st':
-  case 'status':
-    gg.status();
-    break;
-
-  // Log.
-  case 'l':
-  case 'log':
-    var file = cli.args.join(' ');
-    gg.log(file);
-    break;
-
-  // Branch.
-  case 'b':
-  case 'branch':
-    var branch = cli.args.join('-');
-    gg.branch(branch);
-    break;
-
-  // Checkout.
-  case 'ch':
-  case 'checkout':
-    var branch = cli.args.join('-');
-    gg.checkout(branch);
-    break;
+gg.repoCheck(parseCommand);
+function parseCommand() {
+  switch (cli.command) {
+    // Version.
+    case 'v':
+    case 'version':
+    case '-v':
+    case '--version':
+      gg.version();
+      break;
+  
+    // Initialize.
+    case 'i':
+    case 'init':
+    case 'initialize':
+      gg.init();
+      break;
+  
+    // .gitignores.
+    case 'ig':
+    case 'ignore':
+      var template = cli.args.join('-');
+  
+      gg.ignore(template);
+      break;
+  
+    // Clone.
+    case 'cl':
+    case 'clone':
+      var repository = cli.args[0];
+  
+      if (typeof repository === 'undefined') {
+        repository = '';
+      }
+  
+      if (repository.substring(0, 7) === 'http://' || repository.substring(0, 8) === 'https://') { // URL.
+        gg.clone(repository);
+      } else if (repository.indexOf('@') > -1 && repository.indexOf(':') > -1) { // SSH.
+        gg.clone(repository);
+      } else {
+        gg.cloneGitHub(repository);
+      }
+      break;
+  
+    // Add.
+    case 'a':
+    case 'add':
+      if (cli.args[1] === '' || typeof cli.args[1] !== 'undefined') {
+        var options = cli.args[0];
+        var target = cli.args[1];
+        gg.addOptions(options, target);
+      } else {
+        var target = cli.args[0];
+        gg.addSingle(target);
+      }
+      break;
+  
+    // Add all.
+    case 'aa': // Short for 'add all'.
+      gg.addAll();
+      break;
+  
+    // Commit.
+    case 'c':
+    case 'ci':
+    case 'commit':
+      var message = cli.args.join(' ');
+      gg.commit(message, true);
+      break;
+  
+    // Commit without adding.
+    case 'cn':
+      var message = cli.args.join(' ');
+      gg.commit(message, false);
+      break;
+  
+    // Push.
+    case 'p':
+    case 'push':
+      gg.push();
+      break;
+  
+    // Pull.
+    case 'pl':
+    case 'pull':
+      gg.pull();
+      break;
+  
+    // Fetch.
+    case 'f':
+    case 'fetch':
+      gg.fetch();
+      break;
+  
+    // Fetch all.
+    case 'fa': // Short for 'fetch --all'.
+      gg.fetchAll();
+      break;
+  
+    // Status.
+    case 's':
+    case 'st':
+    case 'status':
+      gg.status();
+      break;
+  
+    // Log.
+    case 'l':
+    case 'log':
+      var file = cli.args.join(' ');
+      gg.log(file);
+      break;
+  
+    // Branch.
+    case 'b':
+    case 'branch':
+      var branch = cli.args.join('-');
+      gg.branch(branch);
+      break;
+  
+    // Checkout.
+    case 'ch':
+    case 'checkout':
+      var branch = cli.args.join('-');
+      gg.checkout(branch);
+      break;
+  }
 }
 
 gg.upToDate(false, true);
diff --git a/lib/gg.js b/lib/gg.js
index 12835bf..6660e41 100644
--- a/lib/gg.js
+++ b/lib/gg.js
@@ -600,3 +600,12 @@ exports.checkout = function(branch) {
     });
   }
 };
+
+exports.repoCheck = function(callback) {
+  exec('git rev-parse', function(error, stdout, stderr) {
+    if (stderr.length === 0) {
+      return callback();
+    }
+    console.log(whoops('[✖] Not in a valid git repository! Run "gg i" to initialise one.'));
+  });
+};