diff --git a/codex-rs/core/src/features.rs b/codex-rs/core/src/features.rs
index 86cacae5b..c79bb00bc 100644
--- a/codex-rs/core/src/features.rs
+++ b/codex-rs/core/src/features.rs
@@ -370,7 +370,7 @@ fn legacy_usage_notice(alias: &str, feature: Feature) -> (String, Option<String>
                 None
             } else {
                 Some(format!(
-                    "Enable it with `--enable {canonical}` or `[features].{canonical}` in config.toml. See https://github.com/openai/codex/blob/main/docs/config.md#feature-flags for details."
+                    "Enable it with `--enable {canonical}` or `[features].{canonical}` in config.toml. See https://developers.openai.com/codex/config-basic#feature-flags for details."
                 ))
             };
             (summary, details)
diff --git a/codex-rs/core/tests/suite/deprecation_notice.rs b/codex-rs/core/tests/suite/deprecation_notice.rs
index 0e4ffd88b..dbae99006 100644
--- a/codex-rs/core/tests/suite/deprecation_notice.rs
+++ b/codex-rs/core/tests/suite/deprecation_notice.rs
@@ -50,7 +50,7 @@ async fn emits_deprecation_notice_for_legacy_feature_flag() -> anyhow::Result<()
     assert_eq!(
         details.as_deref(),
         Some(
-            "Enable it with `--enable unified_exec` or `[features].unified_exec` in config.toml. See https://github.com/openai/codex/blob/main/docs/config.md#feature-flags for details."
+            "Enable it with `--enable unified_exec` or `[features].unified_exec` in config.toml. See https://developers.openai.com/codex/config-basic#feature-flags for details."
         ),
     );