diff --git a/lib/scholar/cluster/optics.ex b/lib/scholar/cluster/optics.ex
index 4d991b2f..1cd451cf 100644
--- a/lib/scholar/cluster/optics.ex
+++ b/lib/scholar/cluster/optics.ex
@@ -25,14 +25,14 @@ defmodule Scholar.Cluster.OPTICS do
     max_eps: [
       type: {:custom, Scholar.Options, :beta, []},
       doc: """
-        The maximum distance between two samples for one to be considered as in the neighborhood of the other. 
+        The maximum distance between two samples for one to be considered as in the neighborhood of the other.
         Default value of Nx.Constants.infinity() will identify clusters across all scales.
       """
     ],
     eps: [
       type: {:custom, Scholar.Options, :beta, []},
       doc: """
-        The maximum distance between two samples for one to be considered as in the neighborhood of the other. 
+        The maximum distance between two samples for one to be considered as in the neighborhood of the other.
         By default it assumes the same value as max_eps.
       """
     ],
@@ -58,7 +58,7 @@ defmodule Scholar.Cluster.OPTICS do
   @opts_schema NimbleOptions.new!(opts)
 
   @doc """
-  Perform OPTICS clustering for `x` which is tensor of `{n_samples, n_features} shape.
+  Perform OPTICS clustering for `x` which is tensor of `{n_samples, n_features}` shape.
 
   ## Options
 
@@ -67,7 +67,7 @@ defmodule Scholar.Cluster.OPTICS do
   ## Return Values
 
   The function returns a labels tensor of shape `{n_samples}`.
-  Cluster labels for each point in the dataset given to fit().
+  Cluster labels for each point in the dataset given to `fit`.
   Noisy samples are labeled as -1.
 
   ## Examples
diff --git a/lib/scholar/preprocessing.ex b/lib/scholar/preprocessing.ex
index ccdfb56a..eaabd581 100644
--- a/lib/scholar/preprocessing.ex
+++ b/lib/scholar/preprocessing.ex
@@ -140,7 +140,8 @@ defmodule Scholar.Preprocessing do
   end
 
   @doc """
-  It is a shortcut for `Scholar.Preprocessing.OrdinalEncoder.fit_transform/2`.
+  It is a shortcut for `Scholar.Preprocessing.OrdinalEncoder.fit_transform/1`.
+
   See `Scholar.Preprocessing.OrdinalEncoder` for more information.
 
   ## Examples
diff --git a/mix.exs b/mix.exs
index e6c67a34..a98ea77b 100644
--- a/mix.exs
+++ b/mix.exs
@@ -2,7 +2,7 @@ defmodule Scholar.MixProject do
   use Mix.Project
 
   @source_url "https://github.com/elixir-nx/scholar"
-  @version "0.3.1"
+  @version "0.4.0"
 
   def project do
     [