diff --git a/hosts/yodaNas/host-specific.nix b/hosts/yodaNas/host-specific.nix
index 7a952cf..2b280ac 100644
--- a/hosts/yodaNas/host-specific.nix
+++ b/hosts/yodaNas/host-specific.nix
@@ -1,8 +1,12 @@
 { config, pkgs, ... }:
+let
+  name = "Jinja-Compose";
+in
 {
   imports = [
     ../../modules/snowflake.nix
     ./syncthing.nix
+    ./notify-change.nix
   ];
 
   # Update and start Jinja-Compose project
@@ -10,9 +14,9 @@
   # To view the log, run
   #   journalctl -b -u Jinja-Compose -f
   #
-  systemd.timers."Jinja-Compose" = {
+  systemd.timers."${name}" = {
     wantedBy = [ "timers.target" ];
-    partOf = [ "Jinja-Compose.service" ];
+    partOf = [ "${name}.service" ];
     timerConfig = {
       OnBootSec = "0m";
       OnUnitInactiveSec = "30m";
@@ -22,8 +26,8 @@
     };
   };
   # TODO: Add shutdown script (./docker-compose down).
-  systemd.services."Jinja-Compose" = {
-    description = "Update and start Jinja-Compose project";
+  systemd.services."${name}" = {
+    description = "Update and start ${name} project";
     serviceConfig = {
       Type = "oneshot";
       PrivateTmp = true;
diff --git a/hosts/yodaNas/notify-change.nix b/hosts/yodaNas/notify-change.nix
new file mode 100644
index 0000000..3b60b76
--- /dev/null
+++ b/hosts/yodaNas/notify-change.nix
@@ -0,0 +1,106 @@
+{ config, pkgs, ...}:
+let
+  name = "notify-change";
+  subdir = "readonly-git/notify-change";
+  fulldir = "/home/yoda/${subdir}";
+
+  jdk = pkgs.jdk23;
+  gradle = pkgs.gradle.override {
+    java = jdk;
+    javaToolchains = [ jdk ];
+  };
+in
+{
+  # /secrets/"${name}-EMAIL_USER"
+  deployment.keys."${name}-EMAIL_USER" = {
+    keyFile = ../../secrets/user.web.de;
+    destDir = "/secrets";
+    user = "yoda";
+    #group = "smtpd"; # Default: root
+    permissions = "0400";
+    uploadAt = "pre-activation";
+  };
+  # /secrets/"${name}-EMAIL_PASSWORD"
+  deployment.keys."${name}-EMAIL_PASSWORD" = {
+    keyFile = ../../secrets/pwd.web.de;
+    destDir = "/secrets";
+    user = "yoda";
+    #group = "smtpd"; # Default: root
+    permissions = "0400";
+    uploadAt = "pre-activation";
+  };
+  # /secrets/"${name}-ILIAS_USER"
+  deployment.keys."${name}-ILIAS_USER" = {
+    keyFile = ../../secrets/user.ilias.uni-marburg.de;
+    destDir = "/secrets";
+    user = "yoda";
+    #group = "smtpd"; # Default: root
+    permissions = "0400";
+    uploadAt = "pre-activation";
+  };
+  # /secrets/"${name}-ILIAS_PASSWORD"
+  deployment.keys."${name}-ILIAS_PASSWORD" = {
+    keyFile = ../../secrets/pwd.ilias.uni-marburg.de;
+    destDir = "/secrets";
+    user = "yoda";
+    #group = "smtpd"; # Default: root
+    permissions = "0400";
+    uploadAt = "pre-activation";
+  };
+
+  # Download notify-change Git repository.
+#  home-manager.users.yoda = { osConfig, config, pkgs, ... }: {
+#    home.file."${subdir}".source = (builtins.fetchGit {
+#      url = "https://codeberg.org/privacy1st/selenium-webdriver-ide-demo";
+#      ref = "changedetection";
+#      #leaveDotGit = true;
+#    });
+#  };
+
+  # TODO: Properly build gradle project with nix instead of systemd service script "git pull & gradle build"
+
+  # Run service once per day.
+  systemd.timers."${name}" = {
+    wantedBy = [ "timers.target" ];
+    partOf = [ "${name}.service" ];
+    timerConfig = {
+      OnBootSec = "0m";
+      OnUnitInactiveSec = "1d";
+
+      AccuracySec = "5m";
+      RandomizedDelaySec = "5m";
+    };
+  };
+  # Service definition.
+  systemd.services."${name}" = {
+    description = "Send notification on website change";
+    serviceConfig = {
+      Type = "oneshot";
+      PrivateTmp = true;
+      User = "yoda";
+    };
+    path = [
+      pkgs.bash # todo
+      pkgs.git
+      jdk
+      gradle
+      pkgs.firefox
+    ];
+    script = ''
+      set -eu -o pipefail
+
+      TESSERACT_LIB="${pkgs.tesseract}/lib"
+      TESSDATA_PREFIX="${pkgs.tesseract}/share/tessdata"
+
+      if test -d "${fulldir}"; then
+        cd "${fulldir}"
+        git pull
+      else
+        git clone --branch changedetection --single-branch https://codeberg.org/privacy1st/selenium-webdriver-ide-demo.git "${fulldir}"
+        cd "${fulldir}"
+      fi
+
+      gradle :app:test --tests "de.p1st.changedetection.IliasFB12CoursesTest"
+    '';
+  };
+}