diff --git a/documentation/content/en/books/porters-handbook/uses/_index.adoc b/documentation/content/en/books/porters-handbook/uses/_index.adoc
--- a/documentation/content/en/books/porters-handbook/uses/_index.adoc
+++ b/documentation/content/en/books/porters-handbook/uses/_index.adoc
@@ -604,6 +604,55 @@
 
 The format of `featurelist` is described in man:elfctl[1].
 
+[[uses-elixir]]
+== `elixir`
+
+Possible arguments: (none)
+
+Provide support for ports using package:lang/elixir[].
+Adds a build and run time dependency on package:lang/elixir[].
+
+Variables provided by the framework:
+
+`ELIXIR_APP_NAME`::
+Elixir app name as installed in Elixir's lib directory
+`ELIXIR_LIB_ROOT`::
+Elixir default library path
+`ELIXIR_APP_ROOT`::
+Root directory for this Elixir app
+`ELIXIR_HIDDEN`::
+Applications to be hidden from the code path; usually ${PORTNAME}
+`ELIXIR_LOCALE`::
+An UTF-8 locale to be used by Elixir during builds (any UTF-8 locale is good)
+`MIX_CMD`::
+The `mix` command
+`MIX_COMPILE`::
+The `mix` command used to compile an Elixir app
+`MIX_REWRITE`::
+Automatically replace Mix dependencies with code paths
+`MIX_BUILD_DEPS`::
+List of `BUILD_DEPENDS` in category/portname format (commonly referenced to as "deps" in Erlang and Elixir)
+`MIX_RUN_DEPS`::
+List of `RUN_DEPENDS` in category/portname format
+`MIX_DOC_DIRS`::
+Extra doc directories to be installed in `DOCSDIR`
+`MIX_DOC_FILES`::
+Extra doc files to be installed in `DOCSDIR` (usually README.md)
+`MIX_ENV`::
+Environment for the Mix build (same format as `MAKE_ENV`)
+`MIX_ENV_NAME`::
+Name of the Mix build environment, usually "prod"
+`MIX_BUILD_NAME`::
+Name of the build output in _build/, usually `${MIX_ENV_NAME}`
+`MIX_TARGET`::
+Name of the Mix target, usually "compile"
+`MIX_EXTRA_APPS`::
+List of sub-applications to be built, if any
+`MIX_EXTRA_DIRS`::
+List of extra directories to be installed in `ELIXIR_APP_ROOT`
+`MIX_EXTRA_FILES`::
+List of extra files to be installed in `ELIXIR_APP_ROOT`
+
 [[uses-emacs]]
 == `emacs`
 
@@ -666,6 +715,7 @@
 `EMACS_VERSION_SITE_LISPDIR`::
 Include version (e.g. [.filename]#share/emacs/30.1/site-lisp#)
 
+[[uses-erlang]]
 == `erlang`
 
 Possible arguments: (none), `enc`, `rebar`, `rebar3`