diff --git a/app/src/main/java/eu/kanade/tachiyomi/extension/model/Extension.kt b/app/src/main/java/eu/kanade/tachiyomi/extension/model/Extension.kt
index 7fb384cc01..c8f8626da7 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/extension/model/Extension.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/extension/model/Extension.kt
@@ -18,7 +18,8 @@ sealed class Extension {
         val sources: List<Source>,
         override val lang: String,
         val hasUpdate: Boolean = false,
-        val isObsolete: Boolean = false
+        val isObsolete: Boolean = false,
+        val isUnofficial: Boolean = false
     ) : Extension()
 
     data class Available(
diff --git a/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt b/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt
index 0ff9b6e61b..7bbd846954 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt
@@ -31,13 +31,13 @@ internal object ExtensionLoader {
 
     private const val PACKAGE_FLAGS = PackageManager.GET_CONFIGURATIONS or PackageManager.GET_SIGNATURES
 
+    // inorichi's key
+    val officialSignature = "7ce04da7773d41b489f4693a366c36bcd0a11fc39b547168553c285bd7348e23"
     /**
      * List of the trusted signatures.
      */
     var trustedSignatures = mutableSetOf<String>() +
-        Injekt.get<PreferencesHelper>().trustedSignatures().get() +
-        // inorichi's key
-        "7ce04da7773d41b489f4693a366c36bcd0a11fc39b547168553c285bd7348e23"
+        Injekt.get<PreferencesHelper>().trustedSignatures().get() + officialSignature
 
     /**
      * Return a list of all the installed extensions initialized concurrently.
@@ -159,7 +159,10 @@ internal object ExtensionLoader {
             else -> "all"
         }
 
-        val extension = Extension.Installed(extName, pkgName, versionName, versionCode, sources, lang)
+        val extension = Extension.Installed(
+            extName, pkgName, versionName, versionCode, sources, lang,
+            isUnofficial = signatureHash != officialSignature
+        )
         return LoadResult.Success(extension)
     }
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionDetailsController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionDetailsController.kt
index e73e4f9454..bdd3db4289 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionDetailsController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionDetailsController.kt
@@ -84,7 +84,13 @@ class ExtensionDetailsController(bundle: Bundle? = null) :
             .launchIn(scope)
 
         if (extension.isObsolete) {
-            binding.extensionObsolete.visible()
+            binding.extensionWarningBanner.visible()
+            binding.extensionWarningBanner.setText(R.string.obsolete_extension_message)
+        }
+
+        if (extension.isUnofficial) {
+            binding.extensionWarningBanner.visible()
+            binding.extensionWarningBanner.setText(R.string.unofficial_extension_message)
         }
 
         val themedContext by lazy { getPreferenceThemeContext() }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionHolder.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionHolder.kt
index 456806b381..00645722c2 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionHolder.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionHolder.kt
@@ -91,6 +91,10 @@ class ExtensionHolder(view: View, override val adapter: ExtensionAdapter) :
                     setTextColor(context.getResourceColor(R.attr.colorError))
                     setText(R.string.ext_obsolete)
                 }
+                extension.isUnofficial -> {
+                    setTextColor(context.getResourceColor(R.attr.colorError))
+                    setText(R.string.ext_unofficial)
+                }
                 else -> {
                     setText(R.string.ext_details)
                 }
diff --git a/app/src/main/res/layout/extension_detail_controller.xml b/app/src/main/res/layout/extension_detail_controller.xml
index f920ae17e1..743f172575 100644
--- a/app/src/main/res/layout/extension_detail_controller.xml
+++ b/app/src/main/res/layout/extension_detail_controller.xml
@@ -61,7 +61,7 @@
         tools:text="eu.kanade.tachiyomi.extension.en.myext" />
 
     <TextView
-        android:id="@+id/extension_obsolete"
+        android:id="@+id/extension_warning_banner"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginTop="16dp"
@@ -69,7 +69,6 @@
         android:background="@color/red_error"
         android:gravity="center"
         android:padding="16dp"
-        android:text="@string/obsolete_extension_message"
         android:textColor="@android:color/white"
         android:visibility="gone"
         app:layout_constraintEnd_toEndOf="parent"
@@ -87,7 +86,7 @@
         android:text="@string/ext_uninstall"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="@id/guideline"
-        app:layout_constraintTop_toBottomOf="@id/extension_obsolete" />
+        app:layout_constraintTop_toBottomOf="@id/extension_warning_banner" />
 
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/extension_prefs_recycler"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index a0b98bb06f..788a8bcec2 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -206,6 +206,7 @@
     <string name="ext_installing">Installing</string>
     <string name="ext_installed">Installed</string>
     <string name="ext_trust">Trust</string>
+    <string name="ext_unofficial">Unofficial</string>
     <string name="ext_untrusted">Untrusted</string>
     <string name="ext_uninstall">Uninstall</string>
     <string name="ext_preferences">Preferences</string>
@@ -213,6 +214,7 @@
     <string name="untrusted_extension">Untrusted extension</string>
     <string name="untrusted_extension_message">This extension was signed with an untrusted certificate and wasn\'t activated.\n\nA malicious extension could read any login credentials stored in Tachiyomi or execute arbitrary code.\n\nBy trusting this certificate you accept these risks.</string>
     <string name="obsolete_extension_message">This extension is no longer available.</string>
+    <string name="unofficial_extension_message">This extension is not from the official Tachiyomi extensions list.</string>
     <string name="ext_version_info">Version: %1$s</string>
     <string name="ext_language_info">Language: %1$s</string>
     <string name="ext_empty_preferences">No preferences to edit for this extension</string>