diff --git a/Cargo.toml b/Cargo.toml
index 9faaee570354..d270b10ed541 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -81,6 +81,7 @@ unicode = ["textwrap/unicode-width", "unicase"]  # Support for unicode character
 unstable-replace = []
 unstable-multicall = []
 unstable-grouped = []
+unstable-v4 = []
 
 [lib]
 bench = false
diff --git a/Makefile b/Makefile
index e001b23f3fdd..de7391502cfb 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,7 @@ _FEATURES_minimal = --no-default-features --features "std"
 _FEATURES_default =
 _FEATURES_wasm = --features "derive cargo env unicode yaml regex unstable-replace unstable-multicall unstable-grouped"
 _FEATURES_full = --features "derive cargo env unicode yaml regex unstable-replace unstable-multicall unstable-grouped wrap_help"
+_FEATURES_next = ${_FEATURES_full} --features unstable-v4
 _FEATURES_debug = ${_FEATURES_full} --features debug
 _FEATURES_release = ${_FEATURES_full} --release
 
diff --git a/README.md b/README.md
index 6f620359e94a..97644a9ff857 100644
--- a/README.md
+++ b/README.md
@@ -153,6 +153,7 @@ Why use the procedural [Builder API](https://github.com/clap-rs/clap/blob/v3.1.1
 * **unstable-replace**: Enable [`Command::replace`](https://github.com/clap-rs/clap/issues/2836)
 * **unstable-multicall**: Enable [`Command::multicall`](https://github.com/clap-rs/clap/issues/2861)
 * **unstable-grouped**: Enable [`ArgMatches::grouped_values_of`](https://github.com/clap-rs/clap/issues/2924)
+* unstable-v4: Show help messages for possible values in long help [#3312](https://github.com/clap-rs/clap/issues/3312)
 
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