diff --git a/solutions/elixir/rotational-cipher/2/lib/rotational_cipher.ex b/solutions/elixir/rotational-cipher/2/lib/rotational_cipher.ex
new file mode 100644
index 0000000..322dcd9
--- /dev/null
+++ b/solutions/elixir/rotational-cipher/2/lib/rotational_cipher.ex
@@ -0,0 +1,18 @@
+defmodule RotationalCipher do
+  @doc """
+  Given a plaintext and amount to shift by, return a rotated string.
+
+  Example:
+  iex> RotationalCipher.rotate("Attack at dawn", 13)
+  "Nggnpx ng qnja"
+  """
+  @spec rotate(text :: String.t(), shift :: integer) :: String.t()
+  def rotate(text, shift) do
+    shift_char = fn
+      char when char in ?A..?Z -> <<?A + rem(char - ?A + shift, 26)>>
+      char when char in ?a..?z -> <<?a + rem(char - ?a + shift, 26)>>
+      char -> <<char>>
+    end
+    text |> String.to_charlist() |> Enum.map_join(shift_char)
+  end
+end