diff --git a/sickdays/pyproject.toml b/sickdays/pyproject.toml
index a777569..a9ce88f 100644
--- a/sickdays/pyproject.toml
+++ b/sickdays/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "sickdays"
-version = "0.3.0"
+version = "0.4.0"
 description = "Shared sick-day pool: per-date, uncapped, synced; every gate respects it"
 requires-python = ">=3.14"
 # Deliberately NOT gatelock (its __init__ imports tkinter); the HMAC lives in
diff --git a/sickdays/sickdays/__init__.py b/sickdays/sickdays/__init__.py
index c75e58d..be93fe9 100644
--- a/sickdays/sickdays/__init__.py
+++ b/sickdays/sickdays/__init__.py
@@ -45,6 +45,7 @@ from sickdays._constants import (
     LOCKER_ALARM,
     LOCKER_BOOK,
     LOCKER_DIET,
+    LOCKER_FOCUS,
     LOCKER_LEETCODE,
     LOCKER_WORKOUT,
     LOCKERS,
@@ -70,6 +71,7 @@ __all__ = [
     "LOCKER_ALARM",
     "LOCKER_BOOK",
     "LOCKER_DIET",
+    "LOCKER_FOCUS",
     "LOCKER_LEETCODE",
     "LOCKER_WORKOUT",
     "AlreadySickError",
diff --git a/sickdays/sickdays/_constants.py b/sickdays/sickdays/_constants.py
index e75b07e..fc2e04a 100644
--- a/sickdays/sickdays/_constants.py
+++ b/sickdays/sickdays/_constants.py
@@ -68,10 +68,13 @@ LOCKER_DIET: Final = "diet"
 #: The phone ring, the PC fallback ring, the RTC self-wake and the
 #: missed-alarm penalty -- one switch, because they are one alarm.
 LOCKER_ALARM: Final = "alarm"
+#: The focus-project daily-minutes lock (focus-guard).
+LOCKER_FOCUS: Final = "focus"
 LOCKERS: Final = (
     LOCKER_WORKOUT,
     LOCKER_LEETCODE,
     LOCKER_BOOK,
     LOCKER_DIET,
     LOCKER_ALARM,
+    LOCKER_FOCUS,
 )
diff --git a/sickdays/sickdays/gui/_text.py b/sickdays/sickdays/gui/_text.py
index 9c14657..5b13780 100644
--- a/sickdays/sickdays/gui/_text.py
+++ b/sickdays/sickdays/gui/_text.py
@@ -18,6 +18,7 @@ from sickdays._constants import (
     LOCKER_ALARM,
     LOCKER_BOOK,
     LOCKER_DIET,
+    LOCKER_FOCUS,
     LOCKER_LEETCODE,
     LOCKER_WORKOUT,
 )
@@ -34,6 +35,7 @@ LOCKER_LABELS: Final = {
     LOCKER_BOOK: "Book",
     LOCKER_DIET: "Diet",
     LOCKER_ALARM: "Wake alarm",
+    LOCKER_FOCUS: "Focus",
 }
 
 SHEET_HELP: Final = (
diff --git a/sickdays/sickdays/tests/test_gui_text.py b/sickdays/sickdays/tests/test_gui_text.py
index 43a08a9..d9a3ca9 100644
--- a/sickdays/sickdays/tests/test_gui_text.py
+++ b/sickdays/sickdays/tests/test_gui_text.py
@@ -26,6 +26,7 @@ def test_labels_match_the_phone() -> None:
         "Book",
         "Diet",
         "Wake alarm",
+        "Focus",
     ]
 
 
diff --git a/sickdays/sickdays/tests/test_keep_api.py b/sickdays/sickdays/tests/test_keep_api.py
index ce32448..664d77f 100644
--- a/sickdays/sickdays/tests/test_keep_api.py
+++ b/sickdays/sickdays/tests/test_keep_api.py
@@ -200,3 +200,11 @@ def test_the_keep_edit_refusals() -> None:
     remove_sick_day(TOMORROW, now=TODAY)
     with pytest.raises(NotSickError):
         set_kept_lockers(TOMORROW, ["book"], now=TODAY)
+
+
+def test_focus_is_a_locker_a_sick_day_stands_down_unless_kept() -> None:
+    add_sick_day(TOMORROW, now=TODAY)
+    assert stands_down("focus", TOMORROW)
+    set_kept_lockers(TOMORROW, ["focus"], now=TODAY)
+    assert not stands_down("focus", TOMORROW)
+    assert stands_down("workout", TOMORROW)