diff --git a/README.md b/README.md
index 9c74b82d1..5373a33b9 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,7 @@ We provide a Binder environment for BrainPy. You can use the following button to
 - **[brainpy-datasets](https://github.com/brainpy/datasets)**: Neuromorphic and Cognitive Datasets for Brain Dynamics Modeling.
 - [《神经计算建模实战》 (Neural Modeling in Action)](https://github.com/c-xy17/NeuralModeling)
 - [第一届神经计算建模与编程培训班 (First Training Course on Neural Modeling and Programming)](https://github.com/brainpy/1st-neural-modeling-and-programming-course)
+- [第二届神经计算建模与编程培训班 (Second Training Course on Neural Modeling and Programming)](https://github.com/brainpy/2st-neural-modeling-and-programming-course)
 
 
 ## Citing 
diff --git a/brainpy/__init__.py b/brainpy/__init__.py
index 1342eb9a0..272a7a0a7 100644
--- a/brainpy/__init__.py
+++ b/brainpy/__init__.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-__version__ = "2.4.6.post2"
+__version__ = "2.4.6.post4"
 
 # fundamental supporting modules
 from brainpy import errors, check, tools
diff --git a/brainpy/_src/running/pathos_multiprocessing.py b/brainpy/_src/running/pathos_multiprocessing.py
index f652217d9..e3eebe510 100644
--- a/brainpy/_src/running/pathos_multiprocessing.py
+++ b/brainpy/_src/running/pathos_multiprocessing.py
@@ -136,7 +136,7 @@ def cpu_ordered_parallel(
   >>>
   >>> def simulate(inp):
   >>>   inp = bm.as_jax(inp)
-  >>>   hh = bp.neurons.HH(1)
+  >>>   hh = bp.dyn.HH(1)
   >>>   runner = bp.DSRunner(hh, inputs=['input', inp],
   >>>                        monitors=['V', 'spike'],
   >>>                        progress_bar=False)
@@ -194,7 +194,7 @@ def cpu_unordered_parallel(
   >>>
   >>> def simulate(inp):
   >>>   inp = bm.as_jax(inp)
-  >>>   hh = bp.neurons.HH(1)
+  >>>   hh = bp.dyn.HH(1)
   >>>   runner = bp.DSRunner(hh, inputs=['input', inp],
   >>>                        monitors=['V', 'spike'],
   >>>                        progress_bar=False)