diff --git a/app/src/main/java/io/timelimit/android/data/model/ConfigurationItem.kt b/app/src/main/java/io/timelimit/android/data/model/ConfigurationItem.kt
index 5fb44e5..15d8336 100644
--- a/app/src/main/java/io/timelimit/android/data/model/ConfigurationItem.kt
+++ b/app/src/main/java/io/timelimit/android/data/model/ConfigurationItem.kt
@@ -212,6 +212,7 @@ object HintsToShow {
     const val TIME_LIMIT_RULE_INTRODUCTION = 8L
     const val CONTACTS_INTRO = 16L
     const val TIMELIMIT_RULE_MUSTREAD = 32L
+    const val BLOCKED_TIME_AREAS_OBSOLETE = 64L
 }
 
 object ExperimentalFlags {
diff --git a/app/src/main/java/io/timelimit/android/ui/manage/category/blocked_times/BlockedTimeAreasFragment.kt b/app/src/main/java/io/timelimit/android/ui/manage/category/blocked_times/BlockedTimeAreasFragment.kt
index 4230893..a31fad3 100644
--- a/app/src/main/java/io/timelimit/android/ui/manage/category/blocked_times/BlockedTimeAreasFragment.kt
+++ b/app/src/main/java/io/timelimit/android/ui/manage/category/blocked_times/BlockedTimeAreasFragment.kt
@@ -24,15 +24,20 @@ import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import com.google.android.material.snackbar.Snackbar
 import io.timelimit.android.R
+import io.timelimit.android.async.Threads
+import io.timelimit.android.coroutines.runAsync
 import io.timelimit.android.data.Database
 import io.timelimit.android.data.customtypes.ImmutableBitmask
 import io.timelimit.android.data.model.Category
+import io.timelimit.android.data.model.HintsToShow
 import io.timelimit.android.data.model.withConfigCopiedToOtherDates
 import io.timelimit.android.livedata.map
+import io.timelimit.android.livedata.waitForNonNullValue
 import io.timelimit.android.logic.DefaultAppLogic
 import io.timelimit.android.sync.actions.UpdateCategoryBlockedTimesAction
 import io.timelimit.android.ui.main.ActivityViewModel
 import io.timelimit.android.ui.main.getActivityViewModel
+import io.timelimit.android.ui.mustread.MustReadFragment
 import kotlinx.android.synthetic.main.fragment_blocked_time_areas.*
 
 class BlockedTimeAreasFragment : Fragment(), CopyBlockedTimeAreasDialogFragmentListener {
@@ -59,6 +64,22 @@ class BlockedTimeAreasFragment : Fragment(), CopyBlockedTimeAreasDialogFragmentL
         super.onCreate(savedInstanceState)
 
         items.value = MinuteOfWeekItems
+
+        if (savedInstanceState == null) {
+            database.let { database ->
+                runAsync {
+                    val wasShown = database.config().wereHintsShown(HintsToShow.BLOCKED_TIME_AREAS_OBSOLETE).waitForNonNullValue()
+
+                    if (!wasShown) {
+                        MustReadFragment.newInstance(R.string.must_read_blocked_time_areas_obsolete).show(parentFragmentManager)
+
+                        Threads.database.execute {
+                            database.config().setHintsShownSync(HintsToShow.BLOCKED_TIME_AREAS_OBSOLETE)
+                        }
+                    }
+                }
+            }
+        }
     }
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
diff --git a/app/src/main/res/values-de/strings-must-read.xml b/app/src/main/res/values-de/strings-must-read.xml
index c2a7eca..5e472f6 100644
--- a/app/src/main/res/values-de/strings-must-read.xml
+++ b/app/src/main/res/values-de/strings-must-read.xml
@@ -32,4 +32,9 @@
     <string name="must_read_add_already_assigned_apps">
         Apps mit Kategorie werden beim Hinzufügen aus der vorherigen Kategorie entfernt - für mehrere Kategorien gleichzeitig können Sie Ober- und Unter-Kategorien verwenden
     </string>
+    <string name="must_read_blocked_time_areas_obsolete">
+        Die Sperzeiten sind veraltet. Sie können stattdessen Zeitbegrenzungsregeln für
+        Teile eines Tages mit 0 Minuten Dauer verwenden. Die Sperrzeiten werden in der Zukunft
+        entfernt werden.
+    </string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings-must-read.xml b/app/src/main/res/values/strings-must-read.xml
index ba00ecf..cb44d13 100644
--- a/app/src/main/res/values/strings-must-read.xml
+++ b/app/src/main/res/values/strings-must-read.xml
@@ -13,7 +13,7 @@
   You should have received a copy of the GNU General Public License
   along with this program. If not, see <https://www.gnu.org/licenses/>.
 -->
-<resources>
+<resources xmlns:tools="http://schemas.android.com/tools">
     <string name="must_read_child_manipulation">
         Because some users do not realize it:
         \n1st: In the default settings, TimeLimit can be removed easily, even by children.
@@ -32,4 +32,9 @@
         Apps with category are removed from the previous category when they are added to a new category -
         use parent and child categories to \"add\" an App to multiple categories
     </string>
+    <string name="must_read_blocked_time_areas_obsolete" tools:ignore="MissingTranslation">
+        The blocked time areas are deprecated. You can use time limit rules for parts
+        of a day with zero minutes usage duration instead. The blocked time areas will be
+        removed in the future.
+    </string>
 </resources>
\ No newline at end of file