diff --git a/README.md b/README.md
index c2e49f1..61ce1a4 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Clock
 
-*Event scheduler designed for asyncgui programs.*
+Provides async time-related functionality.
 
 ```python
 import asyncgui
@@ -14,11 +14,11 @@ async def async_fn():
 
 asyncgui.start(async_fn())
 clock.tick(10)  # Advances the clock by 10 time units.
-clock.tick(10)  # Total of 20 time units. The task above will wake up, and prints 'Hello'.
+clock.tick(10)  # Total of 20 time units. The async_fn will wake up, and prints 'Hello'.
 ```
 
 The example above effectively illustrate how this module works but it's not practical.
-In a real-world program, you probably want to call ``clock.tick()`` in a loop or schedule it to be called repeatedly using another scheduling API.
+In a real-world program, you probably want to call ``clock.tick()`` in a main loop.
 For example, if you are using `PyGame`, you may want to do:
 
 ```python
@@ -33,15 +33,6 @@ while running:
     clock.tick(dt)
 ```
 
-And if you are using `Kivy`, you may want to do:
-
-```python
-from kivy.clock import Clock
-
-clock = asyncui_ext.clock.Clock()
-Clock.schedule_interval(clock.tick, 0)
-```
-
 ## Installation
 
 Pin the minor version.
@@ -58,7 +49,3 @@ pip install "asyncgui-ext-clock>=0.5,<0.6"
 - CPython 3.12
 - CPython 3.13
 - PyPy 3.10
-
-## Misc
-
-- [YouTube Demo](https://youtu.be/kPVzO8fF0yg) (with Kivy)
diff --git a/src/asyncgui_ext/clock.py b/src/asyncgui_ext/clock.py
index df2ea8c..17ec13f 100644
--- a/src/asyncgui_ext/clock.py
+++ b/src/asyncgui_ext/clock.py
@@ -336,7 +336,7 @@ async def interpolate_scalar(self, start, end, *, duration, step=0, transition=_
 
     interpolate = interpolate_scalar
     '''
-    An alias for :meth:`interpolate_scalar`.
+    An alias of :meth:`interpolate_scalar`.
 
     .. versionadded:: 0.5.2
     '''
@@ -380,7 +380,7 @@ async def interpolate_sequence(self, start, end, *, duration, step=0, transition
 
     interpolate_seq = interpolate_sequence
     '''
-    An alias for :meth:`interpolate_sequence`.
+    An alias of :meth:`interpolate_sequence`.
     '''
 
     def _update(setattr, zip, min, obj, duration, transition, anim_params, task, p_time, dt):
@@ -440,7 +440,7 @@ def _anim_attrs(
 
     def anim_attrs(self, obj, *, duration, step=0, transition=_linear, **animated_properties) -> Awaitable:
         '''
-        Animates attibutes of any object.
+        Animates attributes of any object.
 
         .. code-block::
 
@@ -448,6 +448,16 @@ def anim_attrs(self, obj, *, duration, step=0, transition=_linear, **animated_pr
 
             obj = types.SimpleNamespace(x=0, size=(200, 300))
             await clock.anim_attrs(obj, x=100, size=(400, 400), duration=2)
+
+        Only numbers and flat numeric sequences are supported.
+        Nested sequences and dictionaries are not supported.
+
+        .. code-block::
+
+            await anim_attrs(obj, dictionary={'x': 1.})  # not supported
+            await anim_attrs(obj, nested_sequence=[[10, 20, ]])  # not supported
+
+            await anim_attrs(obj, number=1, flat_sequence=(100, 200))  # OK
         '''
         return self._anim_attrs(obj, duration, step, transition, animated_properties)