add configuration hint for exrm/distillery releases

README.md

@@ -123,3 +123,25 @@ config :pdf_generator,
 
 For more info, read the [docs on hex](http://hexdocs.pm/pdf_generator) or issue
 `h PdfGenerator` in your iex shell.
+
+# Common issues
+
+## Running from within distillery or exrm releases
+
+**ERROR** 
+
+`(UndefinedFunctionError) function Misc.Random.string/0 is undefined (module Misc.Random is not available)`
+
+**FIX**
+
+For now, unfortunately, it's required to add `misc_ramdom` to either your
+`included_applications` section in your `mix.exs` (exrm) or for (distillery) add
+it to your release/applications list in `rel/config.exs`.
+
+```
+...
+release :your_app do
+  set version: current_version(:your_app)
+  set applications: [:misc_random]
+end
+```