diff --git a/README.md b/README.md
index 2aee2e2..6055806 100644
--- a/README.md
+++ b/README.md
@@ -294,8 +294,8 @@ This is still in dev, works great but roughness is expected, and contributions a
 
 - Make your changes without changing the design patterns.
 - Write tests for your changes if necessary.
-- Install locally with `pip install -e .`.
-- Run tests with `python -m unittest discover -s tests`.
+- Install locally with `pip3 install -e .`.
+- Run tests with `python3 -m unittest discover -s tests`.
 - Then submit a pull request.
 
 Contributions can be made in various forms:
diff --git a/nanodl/__src/utils/data.py b/nanodl/__src/utils/data.py
index 6e4746b..ece3683 100644
--- a/nanodl/__src/utils/data.py
+++ b/nanodl/__src/utils/data.py
@@ -110,7 +110,7 @@ def __init__(
         self.shuffle = shuffle
         self.drop_last = drop_last
 
-        self.keys = __PRNGSequence(seed=Config.default().global_seed)
+        self.keys = _PRNGSequence(seed=Config.default().global_seed)
         self.data_len = len(dataset)  # Length of the dataset
         self.indices = jnp.arange(self.data_len)  # available indices in the dataset
         self.pose = 0  # record the current position in the dataset
@@ -162,7 +162,7 @@ def default(cls):
         return cls(rng_reserve_size=1, global_seed=42)
 
 
-class __PRNGSequence(Iterator[jax.random.PRNGKey]):
+class _PRNGSequence(Iterator[jax.random.PRNGKey]):
     """
     An Iterator of Jax PRNGKey (minimal version of `haiku.PRNGSequence`).