diff --git a/hermes_cli/config.py b/hermes_cli/config.py
index 1d9f88e593..275ce387d5 100644
--- a/hermes_cli/config.py
+++ b/hermes_cli/config.py
@@ -784,7 +784,7 @@ DEFAULT_CONFIG = {
         # UI language for static user-facing messages (approval prompts, a
         # handful of gateway slash-command replies).  Does NOT affect agent
         # responses, log lines, tool outputs, or slash-command descriptions.
-        # Supported: en, zh, ja, de, es, fr, uk.  Unknown values fall back to en.
+        # Supported: en, zh, ja, de, es, fr, tr, uk.  Unknown values fall back to en.
         "language": "en",
         # TUI busy indicator style: kaomoji (default), emoji, unicode (braille
         # spinner), or ascii.  Live-swappable via `/indicator <style>`.
diff --git a/locales/en.yaml b/locales/en.yaml
index e84af4d031..017c73c75e 100644
--- a/locales/en.yaml
+++ b/locales/en.yaml
@@ -7,7 +7,7 @@
 #
 # Keys are dotted paths; nesting below is purely for readability.  Values may
 # contain {placeholder} tokens for str.format substitution.  When adding a
-# new key, add it to EVERY locale file (en/zh/ja/de/es/fr/uk) in the same commit --
+# new key, add it to EVERY locale file (en/zh/ja/de/es/fr/tr/uk) in the same commit --
 # tests/agent/test_i18n.py asserts catalog parity.
 
 approval:
diff --git a/tests/agent/test_i18n.py b/tests/agent/test_i18n.py
index f233a27358..f59d3fb430 100644
--- a/tests/agent/test_i18n.py
+++ b/tests/agent/test_i18n.py
@@ -92,6 +92,9 @@ def test_normalize_lang_accepts_aliases():
     assert i18n._normalize_lang("Ukrainian") == "uk"
     assert i18n._normalize_lang("uk-UA") == "uk"
     assert i18n._normalize_lang("ua") == "uk"
+    assert i18n._normalize_lang("Turkish") == "tr"
+    assert i18n._normalize_lang("tr-TR") == "tr"
+    assert i18n._normalize_lang("türkçe") == "tr"
 
 
 def test_normalize_lang_unknown_falls_back():
@@ -130,6 +133,7 @@ def test_t_explicit_lang():
     assert i18n.t("approval.denied", lang="en").endswith("Denied")
     assert i18n.t("approval.denied", lang="zh").endswith("已拒绝")
     assert i18n.t("approval.denied", lang="uk").endswith("Відхилено")
+    assert i18n.t("approval.denied", lang="tr").endswith("Reddedildi")
 
 
 def test_t_formats_placeholders():
diff --git a/website/docs/user-guide/configuration.md b/website/docs/user-guide/configuration.md
index 246c0ff49b..07f5ba0eed 100644
--- a/website/docs/user-guide/configuration.md
+++ b/website/docs/user-guide/configuration.md
@@ -1167,14 +1167,14 @@ display:
   show_cost: false        # Show estimated $ cost in the CLI status bar
   tool_preview_length: 0  # Max chars for tool call previews (0 = no limit, show full paths/commands)
   runtime_metadata_footer: false  # Gateway: append a runtime-context footer to final replies
-  language: en            # UI language for static messages (approval prompts, some gateway replies). en | zh | ja | de | es | fr | uk
+  language: en            # UI language for static messages (approval prompts, some gateway replies). en | zh | ja | de | es | fr | tr | uk
 ```
 
 ### UI language for static messages
 
 The `display.language` setting translates a small set of static user-facing messages — the CLI approval prompt, a handful of gateway slash-command replies (e.g. restart-drain notices, "approval expired", "goal cleared"). It does **not** translate agent responses, log lines, tool output, error tracebacks, or slash-command descriptions — those stay in English. If you want the agent itself to reply in another language, just tell it in your prompt or system message.
 
-Supported values: `en` (default), `zh` (Simplified Chinese), `ja` (Japanese), `de` (German), `es` (Spanish), `fr` (French), `uk` (Ukrainian). Unknown values fall back to English.
+Supported values: `en` (default), `zh` (Simplified Chinese), `ja` (Japanese), `de` (German), `es` (Spanish), `fr` (French), `tr` (Turkish), `uk` (Ukrainian). Unknown values fall back to English.
 
 You can also set this per-session with the `HERMES_LANGUAGE` env var, which overrides the config value.