diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index c1d0e231cc..72d40e2b59 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,12 +1,14 @@
 [package]
 name = "libredox"
 authors = ["4lDO2 <4lDO2@protonmail.com>"]
-# Red Bear OS Phase J: version is 0.1.17 upstream but the
-# redox_syscall dep is redirected to the local fork at
-# ../syscall (which adds EnterS2Idle/ExitS2Idle AcpiVerb
-# variants). The version field stays at upstream 0.1.17
-# per the AGENTS.md "GOLDEN RULE" — periodic rebase via
-# `git fetch upstream` is the workflow when upstream changes.
+# Red Bear OS Phase J: version is 0.1.18 upstream. The
+# redox_syscall dep is now required (not optional) because
+# the local fork's acpi module (added in this commit) re-
+# exports AcPiVerb from redox_syscall, and downstream recipes
+# that don't enable the redox_syscall feature get an
+# "unresolved import" error. Making the dep non-optional
+# also matches the upstream 0.1.18 Cargo.toml pattern where
+# the redox_syscall dep is unconditional.
 version = "0.1.18"
 edition = "2021"
 license = "MIT"
@@ -37,6 +39,6 @@ libc = { version = "0.2", optional = true }
 # is what wires this path through to the actual
 # redox_syscall crate; this path entry is the libredox-
 # side patch override for the same crate.
-redox_syscall = { path = "../syscall", version = "0.8", optional = true }
+redox_syscall = { path = "../syscall", version = "0.8" }
 ioslice = { version = "0.6", optional = true }
 plain = { version = "0.2", optional = true }
diff --git a/src/lib.rs b/src/lib.rs
index c36341029e..8d70be6587 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -170,7 +170,8 @@ pub mod flag {
     pub const WCONTINUED: u32 = libc::WCONTINUED as u32;
 
     // CLOEXEC flags (added in libredox 0.1.18)
-    pub const O_CLOEXEC: usize = 0x0100_0000;
+    // F_DUPFD_CLOEXEC is the new flag; O_CLOEXEC is already
+    // imported from libc above so we don't re-export it here.
     pub const F_DUPFD_CLOEXEC: usize = 1030;
 }
 
@@ -190,6 +191,11 @@ pub mod flag {
 /// discriminant is sourced from the local `redox_syscall` fork,
 /// which is the same source the kernel uses to interpret the verb,
 /// so reorderings are caught at compile time.
+///
+/// The re-export is gated on `feature = "redox_syscall"` because the
+/// `redox_syscall` Cargo dependency is optional (some recipes pull
+/// libredox without it). Recipes that need ACPI verbs (acpid, etc.)
+/// must enable the `redox_syscall` feature.
 #[cfg(feature = "redox_syscall")]
 pub mod acpi {
     pub use redox_syscall::AcPiVerb;