diff --git a/crates/uv-configuration/src/preview.rs b/crates/uv-configuration/src/preview.rs
index 38572589b667..39fffa649265 100644
--- a/crates/uv-configuration/src/preview.rs
+++ b/crates/uv-configuration/src/preview.rs
@@ -1,6 +1,7 @@
 use std::fmt::{Display, Formatter};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+#[cfg_attr(feature = "clap", derive(clap::ValueEnum))]
 pub enum PreviewMode {
     #[default]
     Disabled,
diff --git a/crates/uv/src/lib.rs b/crates/uv/src/lib.rs
index fc36bf494ccd..a1df00439ac8 100644
--- a/crates/uv/src/lib.rs
+++ b/crates/uv/src/lib.rs
@@ -1067,6 +1067,11 @@ async fn run(cli: Cli) -> Result<ExitStatus> {
         }
         Commands::Publish(args) => {
             show_settings!(args);
+
+            if globals.preview.is_disabled() {
+                warn_user_once!("`uv.sources` is experimental and may change without warning");
+            }
+
             // Resolve the settings from the command-line arguments and workspace configuration.
             let PublishSettings {
                 files,
diff --git a/crates/uv/tests/publish.rs b/crates/uv/tests/publish.rs
index d06221c41041..ef06f07df399 100644
--- a/crates/uv/tests/publish.rs
+++ b/crates/uv/tests/publish.rs
@@ -19,6 +19,7 @@ fn username_password_no_longer_supported() {
     ----- stdout -----
 
     ----- stderr -----
+    warning: `uv.sources` is experimental and may change without warning
     Publishing 1 file
     Uploading ok-1.0.0-py3-none-any.whl ([SIZE])
     error: Failed to publish `../../scripts/links/ok-1.0.0-py3-none-any.whl` to `https://upload.pypi.org/legacy/`
@@ -42,6 +43,7 @@ fn invalid_token() {
     ----- stdout -----
 
     ----- stderr -----
+    warning: `uv.sources` is experimental and may change without warning
     Publishing 1 file
     Uploading ok-1.0.0-py3-none-any.whl ([SIZE])
     error: Failed to publish `../../scripts/links/ok-1.0.0-py3-none-any.whl` to `https://upload.pypi.org/legacy/`