diff --git a/lib/contexted/module_analyzer.ex b/lib/contexted/module_analyzer.ex
index 81ae3f9..e73a6ee 100644
--- a/lib/contexted/module_analyzer.ex
+++ b/lib/contexted/module_analyzer.ex
@@ -118,6 +118,9 @@ defmodule Contexted.ModuleAnalyzer do
   defp format_type({:type, _, :range, [{:integer, _, from}, {:integer, _, to}]}, _module),
     do: "#{from}..#{to}"
 
+  defp format_type({:type, _, :binary, [{:integer, _, 0}, {:integer, _, 0}]}, _module),
+    do: "<<>>"
+
   defp format_type({:type, _, :binary, [{:integer, _, size}, {:integer, _, 0}]}, _module),
     do: "<<_::#{size}>>"
 
@@ -126,6 +129,8 @@ defmodule Contexted.ModuleAnalyzer do
 
   defp format_type({:type, _, type_name, _}, _module), do: "#{type_name}()"
 
+  defp format_type({:op, _, operator, type}, module), do: "#{operator}#{format_type(type, module)}"
+
   defp format_type({:integer, _, integer}, _module), do: "#{integer}"
 
   defp format_type({:user_type, _, atom, _}, module) do