diff --git a/cli/flags.rs b/cli/flags.rs
index 7271358b6c..88b13ca59a 100644
--- a/cli/flags.rs
+++ b/cli/flags.rs
@@ -443,6 +443,8 @@ static ENV_VARIABLES_HELP: &str = r#"ENVIRONMENT VARIABLES:
     DENO_DIR             Set the cache directory
     DENO_INSTALL_ROOT    Set deno install's output directory
                          (defaults to $HOME/.deno/bin)
+    DENO_FUTURE_CHECK    Opt-in into new behavior of "deno run" that doesn't
+                         perform type-checking by default.
     DENO_WEBGPU_TRACE    Directory to use for wgpu traces
     HTTP_PROXY           Proxy address for HTTP requests
                          (module downloads, fetch)