diff --git a/lib/req.ex b/lib/req.ex
index 819cfde..bcce4d2 100644
--- a/lib/req.ex
+++ b/lib/req.ex
@@ -185,7 +185,7 @@ defmodule Req do
       [`put_path_params`](`Req.Steps.put_path_params/1`) step.)
 
     * `:path_params_style` - configures how `:path_params` are expressed (via
-      [`put_path_params_style`](`Req.Steps.put_path_params_style/1`) step). Can be one of:
+      [`put_path_params`](`Req.Steps.put_path_params/1`) step). Can be one of:
 
         * `:colon` - default, params are expressed as `:name` in the path.
 
diff --git a/lib/req/steps.ex b/lib/req/steps.ex
index 48a95f6..0f1802f 100644
--- a/lib/req/steps.ex
+++ b/lib/req/steps.ex
@@ -72,7 +72,6 @@ defmodule Req.Steps do
       put_base_url: &Req.Steps.put_base_url/1,
       auth: &Req.Steps.auth/1,
       put_params: &Req.Steps.put_params/1,
-      put_path_params_style: &Req.Steps.put_path_params_style/1,
       put_path_params: &Req.Steps.put_path_params/1,
       put_range: &Req.Steps.put_range/1,
       cache: &Req.Steps.cache/1,
@@ -402,7 +401,8 @@ defmodule Req.Steps do
 
   By default, params in the URL path are expressed as strings prefixed with `:`. For example,
   `:code` in `https://httpbin.org/status/:code`. If you want to use the `{code}` syntax,
-  set `path_params_style: :curly` (see `put_path_params_style/1`).
+  set `path_params_style: :curly`. Param names must start with a letter and can contain letters,
+  digits, and underscores; this is true both for `:colon_params` as well as `{curly_params}`.
 
   Path params are replaced in the request URL path. The path params are specified as a keyword
   list of parameter names and values, as in the examples below. The values of the parameters are
@@ -411,12 +411,22 @@ defmodule Req.Steps do
   ## Request Options
 
     * `:path_params` - params to add to the templated path. Defaults to `[]`.
+    * `:path_params_style` (*available since v0.5.1*) - how path params are expressed.
+      Can be one of:
+
+        * `:colon` (default) for Plug-style parameters, such as
+          `https://httpbin.org/status/:code`.
+
+        * `:curly` for OpenAPI-style parameters, such as `https://httpbin.org/status/{code}`.
 
   ## Examples
 
       iex> Req.get!("https://httpbin.org/status/:code", path_params: [code: 200]).status
       200
 
+      iex> Req.get!("https://httpbin.org/status/{code}", path_params: [code: 201], path_params_style: :curly).status
+      200
+
   """
   @doc step: :request
   def put_path_params(request) do
@@ -435,7 +445,7 @@ defmodule Req.Steps do
 
   defp apply_path_params(request, params) do
     regex =
-      case Req.Request.get_private(request, :path_params_style) || raise("missing") do
+      case Req.Request.get_option(request, :path_params_style, :colon) do
         :colon -> ~r/:([a-zA-Z]{1}[\w_]*)/
         :curly -> ~r/\{([a-zA-Z]{1}[\w_]*)\}/
       end
@@ -454,19 +464,6 @@ defmodule Req.Steps do
     end)
   end
 
-  @doc """
-  TODO
-  """
-  @doc since: "0.5.1"
-  @doc step: :request
-  def put_path_params_style(request) do
-    Req.Request.put_private(
-      request,
-      :path_params_style,
-      Req.Request.get_option(request, :path_params_style, :colon)
-    )
-  end
-
   @doc """
   Adds params to request query string.
 
diff --git a/test/req/steps_test.exs b/test/req/steps_test.exs
index 8df755a..c6b07e1 100644
--- a/test/req/steps_test.exs
+++ b/test/req/steps_test.exs
@@ -266,9 +266,9 @@ defmodule Req.StepsTest do
       Req.new(url: "http://foo/:id{ola}", path_params: [id: "abc|def"]) |> Req.Request.prepare()
 
     assert URI.to_string(req.url) == "http://foo/abc%7Cdef{ola}"
-  end
 
-  test "put_path_params_style" do
+    # With :curly style.
+
     req =
       Req.new(url: "http://foo/{id}:bar", path_params: [id: "abc|def"], path_params_style: :curly)
       |> Req.Request.prepare()