diff --git a/lib/ex_doc/formatter/html/autolink.ex b/lib/ex_doc/formatter/html/autolink.ex
index 7d6bded0d..fcb8416d1 100644
--- a/lib/ex_doc/formatter/html/autolink.ex
+++ b/lib/ex_doc/formatter/html/autolink.ex
@@ -337,7 +337,7 @@ defmodule ExDoc.Formatter.HTML.Autolink do
   will get translated to the new href of the function.
   """
   def local_doc(bin, locals, aliases \\ [], extension \\ ".html", lib_dirs \\ elixir_lib_dirs()) when is_binary(bin) do
-    fun_re = Regex.source(~r{(([ct]:)?([a-z_]+[A-Za-z_\d]*[\\?\\!]?|[\{\}=&\\|\\.<>~*^@\\+\\%\\!-]+)/\d+)})
+    fun_re = Regex.source(~r{(([ct]:)?([a-z_]+[A-Za-z_\d]*[\\?\\!]?|[\{\}=&\\|\\.<>~*^@\\+\\%\\!-\/]+)/\d+)})
     regex = ~r{(?<!\[)`\s*(#{fun_re})\s*`(?!\])}
     elixir_docs = get_elixir_docs(aliases, lib_dirs)
 
@@ -419,7 +419,7 @@ defmodule ExDoc.Formatter.HTML.Autolink do
   end
 
   module_re = Regex.source(~r{(([A-Z][A-Za-z_\d]+)\.)+})
-  fun_re = Regex.source(~r{([ct]:)?(#{module_re}([a-z_]+[A-Za-z_\d]*[\\?\\!]?|[\{\}=&\\|\\.<>~*^@\\+\\%\\!-]+)/\d+)})
+  fun_re = Regex.source(~r{([ct]:)?(#{module_re}(([a-z_]+[A-Za-z_\d]*[\\?\\!]?)|[\{\}=&\\|\\.<>~*^@\\+\\%\\!-\/]+)/\d+)})
   @custom_re ~r{\[(.*?)\]\(`(#{fun_re})`\)}
   @normal_re ~r{(?<!\[)`\s*(#{fun_re})\s*`(?!\])}
 
@@ -489,8 +489,10 @@ defmodule ExDoc.Formatter.HTML.Autolink do
     {_, mod, fun, arity} = split_function(bin)
     {"t:", mod, fun, arity}
   end
-  defp split_function(bin) do
-    [modules, arity] = String.split(bin, "/")
+  defp split_function(bin) when is_binary(bin) do
+    split_function(String.split(bin, "/"))
+  end
+  defp split_function([modules, arity]) do
     {mod, name} =
       modules
       |> String.replace(~r{([^\.])\.}, "\\1 ") # this handles the case of the ".." function
@@ -498,6 +500,9 @@ defmodule ExDoc.Formatter.HTML.Autolink do
       |> Enum.split(-1)
     {"", Enum.join(mod, "."), hd(name), arity}
   end
+  defp split_function([modules, "", arity]) do # handles "/" function
+    split_function([modules <> "/", arity])
+  end
 
   @doc """
   Create links to Erlang functions in code blocks.
diff --git a/test/ex_doc/formatter/html/autolink_test.exs b/test/ex_doc/formatter/html/autolink_test.exs
index c36fb9f3d..d3424e700 100644
--- a/test/ex_doc/formatter/html/autolink_test.exs
+++ b/test/ex_doc/formatter/html/autolink_test.exs
@@ -20,6 +20,7 @@ defmodule ExDoc.Formatter.HTML.AutolinkTest do
     assert Autolink.local_doc("`funny_name\?/1` and `funny_name!/2`",
       ["funny_name\?/1", "funny_name!/2"]) ==
       "[`funny_name\?/1`](#funny_name\?/1) and [`funny_name!/2`](#funny_name!/2)"
+    assert Autolink.local_doc("`//2`", ["//2"]) == "[`//2`](#//2)"
   end
 
   test "autolink to local callbacks" do
@@ -143,6 +144,9 @@ defmodule ExDoc.Formatter.HTML.AutolinkTest do
 
     assert Autolink.elixir_functions("[`f`](`Foo.foo/1`), [`f`](`Foo.foo/1`)", ["Foo.foo/1"]) ==
            "[`f`](Foo.html#foo/1), [`f`](Foo.html#foo/1)"
+
+    assert Autolink.elixir_functions("[`foo`](`Foo.//2`)", ["Foo.//2"]) ==
+           "[`foo`](Foo.html#//2)"
   end
 
   test "autolink functions to types in the project" do