diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 1c26491..fd3d734 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -14,7 +14,7 @@ Current changes
 Added
 -----
 
-* Option to specify mirror site.
+* Option -b | --base to specify mirror site.
 
 Changed
 -------
diff --git a/README.rst b/README.rst
index 0db8e14..e885e35 100644
--- a/README.rst
+++ b/README.rst
@@ -55,8 +55,8 @@ General usage looks like this:
 
 .. code-block:: bash
 
-    aqt [-h][--help] install <qt-version> <host> <target> [<arch>]
-    python -m aqt [-h][--help] install <qt-version> <host> <target> [<arch>]
+    aqt [-h][--help][-O | --outputdir <directory>][-b | --base <mirror url>] install <qt-version> <host> <target> [<arch>]
+    python -m aqt [-h][--help][-O | --outputdir <directory>][-b | --base <mirror url>]  install <qt-version> <host> <target> [<arch>]
 
 * The Qt version is formatted like this: `5.11.3`
 * Host is one of: `linux`, `mac`, `windows`
@@ -72,8 +72,7 @@ run such as follows:
 .. code-block:: bash
 
     C:\> mkdir Qt
-    C:\> cd Qt
-    C:\Qt\> aqt install 5.11.3 windows desktop win64_msvc2017_64
+    C:\> aqt install -O c:\Qt 5.11.3 windows desktop win64_msvc2017_64
 
 
 Example: Installing Qt 5.12.0 for Linux:
@@ -81,8 +80,7 @@ Example: Installing Qt 5.12.0 for Linux:
 .. code-block:: bash
 
     pip install aqtinstall
-    cd /opt
-    sudo aqt install 5.12.0 linux desktop
+    sudo aqt install --outputdir /opt 5.12.0 linux desktop
 
 
 Example: Installing Android (armv7) Qt 5.10.2:
diff --git a/aqt/archives.py b/aqt/archives.py
index a6ac890..4fb5c7d 100644
--- a/aqt/archives.py
+++ b/aqt/archives.py
@@ -44,7 +44,7 @@ class QtPackage:
 
 
 class QtArchives:
-    BASE_URL = 'https://download.qt.io/online/qtsdkrepository/'
+    BASE_URL = 'https://download.qt.io'
     archives = []
     base = None
 
@@ -59,9 +59,9 @@ class QtArchives:
             self.base = self.BASE_URL
         qt_ver_num = qt_version.replace(".", "")
         if os_name == 'windows':
-            archive_url = self.base + os_name + '_x86/' + target + '/' + 'qt5_' + qt_ver_num + '/'
+            archive_url = self.base + '/online/qtsdkrepository/' + os_name + '_x86/' + target + '/' + 'qt5_' + qt_ver_num + '/'
         else:
-            archive_url = self.base + os_name + '_x64/' + target + '/' + 'qt5_' + qt_ver_num + '/'
+            archive_url = self.base + '/online/qtsdkrepository/' + os_name + '_x64/' + target + '/' + 'qt5_' + qt_ver_num + '/'
 
         # Get packages index
         update_xml_url = "{0}Updates.xml".format(archive_url)
diff --git a/aqt/cli.py b/aqt/cli.py
index fe1458f..d659201 100644
--- a/aqt/cli.py
+++ b/aqt/cli.py
@@ -36,7 +36,7 @@ class Cli():
         target = args.target
         os_name = args.host
         output_dir = args.outputdir
-        mirror = args.mirror
+        mirror = args.base
         if arch is None:
             if os_name == "linux" and target == "desktop":
                 arch = "gcc_64"
@@ -88,7 +88,7 @@ class Cli():
                                     "\nandroid:              android_x86, android_armv7")
         install_parser.add_argument('-O', '--outputdir', nargs='?',
                                     help='Target output directory(default current directory)')
-        install_parser.add_argument('-m', '--mirror', nargs='?',
+        install_parser.add_argument('-b', '--base', nargs='?',
                                     help="Specify mirror base url such as http://mirrors.ocf.berkeley.edu/qt/, "
                                          "where 'online' folder exist.")
         list_parser = subparsers.add_parser('list')
diff --git a/docs/cli.rst b/docs/cli.rst
index afd0f1b..743d78a 100644
--- a/docs/cli.rst
+++ b/docs/cli.rst
@@ -51,4 +51,11 @@ long options may be truncated to the shortest unambiguous abbreviation.
 
     Display help text
 
-.. option::
+.. option:: --outputdir, -O <Output Directory>
+
+    specify output directory.
+
+.. option:: --base, -b <base url>
+
+    specify mirror site base url such as  -b 'http://mirrors.ocf.berkeley.edu/qt/'
+    where 'online' folder exist.