diff --git a/python/doc/source/memory.rst b/python/doc/source/memory.rst
index f18919999e0..4806bbb8572 100644
--- a/python/doc/source/memory.rst
+++ b/python/doc/source/memory.rst
@@ -142,18 +142,6 @@ the stream is garbaged-collected, all of the memory is freed:
    stream = None
    pa.total_allocated_bytes()
 
-Classes and functions that may allocate memory will often have an option to
-pass in a custom memory pool:
-
-.. ipython:: python
-
-   my_pool = pa.jemalloc_memory_pool()
-   my_pool
-   my_pool.bytes_allocated()
-   stream = pa.BufferOutputStream(my_pool)
-   stream.write(b'foo')
-   my_pool.bytes_allocated()
-
 On-Disk and Memory Mapped Files
 -------------------------------
 
diff --git a/site/README.md b/site/README.md
index 1b0a82e03db..2c5f9791970 100644
--- a/site/README.md
+++ b/site/README.md
@@ -82,7 +82,7 @@ First, build PyArrow with all optional extensions (Apache Parquet).
 
 ```
 cd ../python
-python setup.py build_ext --inplace --with-parquet
+python setup.py build_ext --inplace --with-parquet --with-plasma
 python setup.py build_sphinx -s doc/source
 rsync -r doc/_build/html/ ../site/asf-site/docs/python/
 ```