diff --git a/README.md b/README.md
index fcf4862..2b68f47 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 [![Quality Score][ico-code-quality]][link-code-quality]
 [![Total Downloads][ico-downloads]][link-downloads]
 
-**Note:** Replace ```:author_name``` ```:author_username``` ```:author_website``` ```:author_email``` ```:vendor``` ```:package_name``` ```:package_description``` with their correct values in [README.md](README.md), [CHANGELOG.md](CHANGELOG.md), [CONTRIBUTING.md](CONTRIBUTING.md), [LICENSE.md](LICENSE.md) and [composer.json](composer.json) files, then delete this line.
+**Note:** Replace ```:author_name``` ```:author_username``` ```:author_website``` ```:author_email``` ```:vendor``` ```:package_name``` ```:package_description``` with their correct values in [README.md](README.md), [CHANGELOG.md](CHANGELOG.md), [CONTRIBUTING.md](CONTRIBUTING.md), [LICENSE.md](LICENSE.md) and [composer.json](composer.json) files, then delete this line. You can run `$ php prefill.php` in the command line to make all replacements at once.
 
 This is where your description should go. Try and limit it to a paragraph or two, and maybe throw in a mention of what
 PSRs you support to avoid any confusion with users and contributors.
diff --git a/prefill.php b/prefill.php
new file mode 100644
index 0000000..4967278
--- /dev/null
+++ b/prefill.php
@@ -0,0 +1,107 @@
+<?php
+
+define('COL_DESCRIPTION' , 0);
+define('COL_HELP' ,        1);
+define('COL_DEFAULT' ,     2);
+
+$fields = [
+    'author_name' =>            ['Your name',             '',                                                ''],
+    'author_github_username' => ['Your Github username',  '<username> in https://github.com/username',       ''],
+    'author_email' =>           ['Your email address',    '',                                                ''],
+    'author_twitter' =>         ['Your twitter username', '',                                                '@{author_github_username}'],
+    'author_website' =>         ['Your website',          '',                                                'https://github.com/{author_github_username}'],
+
+    'package_vendor' =>         ['Package vendor',        '<vendor> in https://github.com/vendor/package',   '{author_github_username}'],
+    'package_name' =>           ['Package name',          '<package> in https://github.com/vendor/package',  ''],
+    'package_description' =>    ['Package very short description',   '',                                     ''],
+    
+    'psr4_namespace' =>         ['PSR-4 namespace',       'usually, Vendor\\Package',                        '{package_vendor}\\{package_name}'],
+];
+
+$values = [];
+
+$replacements = [
+    ':vendor\\\\:package_name\\\\' => function () use(&$values) { return str_replace('\\', '\\\\', $values['psr4_namespace']) . '\\\\'; },
+    ':author_name'                 => function () use(&$values) { return $values['author_name']; },
+    ':author_username'             => function () use(&$values) { return $values['author_github_username']; },
+    ':author_website'              => function () use(&$values) { return $values['author_website'] ?: ('https://github.com/' . $values['author_github_username']); },
+    ':author_email'                => function () use(&$values) { return $values['author_email'] ?: ($values['author_github_username'] . '@example.com'); },
+    ':vendor'                      => function () use(&$values) { return $values['package_vendor']; },
+    ':package_name'                => function () use(&$values) { return $values['package_name']; },
+    ':package_description'         => function () use(&$values) { return $values['package_description']; },
+    'League\\Skeleton'             => function () use(&$values) { return $values['psr4_namespace']; },
+];
+
+function read_from_console ($prompt) {
+    if ( function_exists('readline') ) {
+        $line = trim(readline($prompt));
+        if (!empty($line)) {
+            readline_add_history($line);
+        }
+    } else {
+        echo $prompt;
+        $line = trim(fgets(STDIN));
+    }
+    return $line;
+}
+
+function interpolate ($text, $values) {
+    if ( !preg_match_all('/\{(\w+)\}/', $text, $m) ) {
+        return $text;
+    }
+    foreach ( $m[0] as $k => $str ) {
+        $f = $m[1][$k];
+        $text = str_replace($str, $values[$f], $text);
+    }
+    return $text;
+}
+
+$modify = 'n';
+do {
+    if ( $modify == 'q' ) {
+        exit;
+    }
+    
+    $values = [];
+    
+    echo "----------------------------------------------------------------------\n";
+    echo "Please, provide the following information:\n";
+    echo "----------------------------------------------------------------------\n";
+    foreach ( $fields as $f => $field) {
+        $default = isset($field[COL_DEFAULT]) ? interpolate($field[COL_DEFAULT], $values): '';
+        $prompt = sprintf('%s%s%s: ',
+            $field[COL_DESCRIPTION],
+            $field[COL_HELP] ? ' (' . $field[COL_HELP] . ')': '',
+            $field[COL_DEFAULT] !== '' ? ' [' . $default . ']': '');
+        $values[$f] = read_from_console($prompt);
+        if ( empty($values[$f]) ) {
+            $values[$f] = $default;
+        }
+    }
+    echo "\n";
+    
+    echo "----------------------------------------------------------------------\n";
+    echo "Please, check that everything is correct:\n";
+    echo "----------------------------------------------------------------------\n";
+    foreach ( $fields as $f => $field ) {
+        echo $field[COL_DESCRIPTION] . ": $values[$f]\n";
+    }
+    echo "\n";
+} while ( ($modify = strtolower(read_from_console('Modify files with these values? [y/N/q] '))) != 'y' );
+echo "\n";
+
+$files = array_merge (
+    glob(__DIR__ . '/*.md'),
+    glob(__DIR__ . '/composer.json'),
+    glob(__DIR__ . '/src/*.php')
+);
+foreach ($files as $f) {
+    $contents = file_get_contents($f);
+    foreach ($replacements as $str => $func) {
+        $contents = str_replace($str, $func(), $contents);
+    }
+    file_put_contents($f, $contents);
+}
+
+echo "Done.\n";
+echo "Now you can remove the file '" . basename(__FILE__) . "'.\n";