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diff --git a/docs/en/erlang.mk/1/guide/app.asciidoc b/docs/en/erlang.mk/1/guide/app.asciidoc
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--- a/docs/en/erlang.mk/1/guide/app.asciidoc
+++ b/docs/en/erlang.mk/1/guide/app.asciidoc
@@ -130,6 +130,13 @@ your situation.
The application callback module.
`PROJECT_REGISTERED`::
List of the names of all registered processes.
+`PROJECT_ENV`::
+ Configuration parameters used by the application.
+`PROJECT_APP_EXTRA_KEYS`::
+ Other keys you want to add to the application `.app` file.
+ The variable content is written as-is to the `.app` file,
+ so be sure to format valid Erlang terms. For example:
+ `PROJECT_APP_EXTRA_KEYS = {maxT, 10000}, {start_phases, [...]}`.
`LOCAL_DEPS`::
List of Erlang/OTP applications this project depends on,
excluding `erts`, `kernel` and `stdlib`, or list of