diff --git a/README.md b/README.md
index 962ae8d..69c4175 100644
--- a/README.md
+++ b/README.md
@@ -48,3 +48,9 @@ Double-click on a geom and hold `Ctrl` to apply forces (right) and torques (left
 
 Press `ESC` to quit.  
 Other key bindings are shown in the overlay menu (almost similar to `mujoco-py`).
+
+# Optional Parameters
+
+- `title`: set the title of the window, for example: `viewer = mujoco_viewer.MujocoViewer(model, data, title='My Demo')` (defaults to `mujoco-python-viewer`). 
+- `width`: set the window width, for example: `viewer = mujoco_viewer.MujocoViewer(model, data, width=300)` (defaults to full screen's width). 
+- `height`: set the window height, for example: `viewer = mujoco_viewer.MujocoViewer(model, data, height=300)` (defaults to full screen's height). 
diff --git a/mujoco_viewer/mujoco_viewer.py b/mujoco_viewer/mujoco_viewer.py
index f82f1ee..ff146aa 100644
--- a/mujoco_viewer/mujoco_viewer.py
+++ b/mujoco_viewer/mujoco_viewer.py
@@ -8,7 +8,7 @@
 
 
 class MujocoViewer:
-    def __init__(self, model, data):
+    def __init__(self, model, data, title="mujoco-python-viewer", width=None, height=None):
         self.model = model
         self.data = data
 
@@ -39,9 +39,15 @@ def __init__(self, model, data):
 
         # glfw init
         glfw.init()
-        width, height = glfw.get_video_mode(glfw.get_primary_monitor()).size
+
+        if not width:
+            width, _ = glfw.get_video_mode(glfw.get_primary_monitor()).size
+
+        if not height:
+            _, height = glfw.get_video_mode(glfw.get_primary_monitor()).size
+
         self.window = glfw.create_window(
-            width, height, "mujoco-python-viewer", None, None)
+            width, height, title, None, None)
         glfw.make_context_current(self.window)
         glfw.swap_interval(1)