diff --git a/aleksis/apps/chronos/templates/chronos/all.html b/aleksis/apps/chronos/templates/chronos/all.html
index a8521b2ca553a8d10397fd3ddf5848622c8af993..bedf5ca129d781ff2f13e198714871bf2c4b7b1c 100644
--- a/aleksis/apps/chronos/templates/chronos/all.html
+++ b/aleksis/apps/chronos/templates/chronos/all.html
@@ -1,3 +1,5 @@
+{# -*- engine:django -*- #}
+
 {% extends 'core/base.html' %}
 
 {% load i18n static %}
diff --git a/aleksis/apps/chronos/templates/chronos/hint_form.html b/aleksis/apps/chronos/templates/chronos/hint_form.html
index f87e297466fdff722efe93db0dc91985b2eef0aa..b0e621311881fd384f02e98211859987223c273a 100644
--- a/aleksis/apps/chronos/templates/chronos/hint_form.html
+++ b/aleksis/apps/chronos/templates/chronos/hint_form.html
@@ -1,3 +1,5 @@
+{# -*- engine:django -*- #}
+
 {% extends 'core/base.html' %}
 {% load material_form martortags static widget_tweaks %}
 
diff --git a/aleksis/apps/chronos/templates/chronos/hints.html b/aleksis/apps/chronos/templates/chronos/hints.html
index 851aa4e6789e1521f2b7aec88a5bcb3cdccd1f89..3c26f0651276472ffc2af4b755e2fc49c657ed08 100644
--- a/aleksis/apps/chronos/templates/chronos/hints.html
+++ b/aleksis/apps/chronos/templates/chronos/hints.html
@@ -1,3 +1,5 @@
+{# -*- engine:django -*- #}
+
 {% extends 'core/base.html' %}
 {% load material_form %}
 {% load martortags %}
diff --git a/aleksis/apps/chronos/templates/chronos/my_timetable.html b/aleksis/apps/chronos/templates/chronos/my_timetable.html
index e9dce53203e937baf6c6be11c2868aaa97ee9883..90adf8fb4a2f0c04eeb605ae7ff6b271a6ab6141 100644
--- a/aleksis/apps/chronos/templates/chronos/my_timetable.html
+++ b/aleksis/apps/chronos/templates/chronos/my_timetable.html
@@ -1,3 +1,5 @@
+{# -*- engine:django -*- #}
+
 {% extends 'core/base.html' %}
 
 {% load i18n static %}
diff --git a/aleksis/apps/chronos/templates/chronos/substitutions.html b/aleksis/apps/chronos/templates/chronos/substitutions.html
index e322bfd65ca6234f6b89dc1594576125df9aef6c..2d0c99044c421e22d9bea5a3ac66733ee471c7fa 100644
--- a/aleksis/apps/chronos/templates/chronos/substitutions.html
+++ b/aleksis/apps/chronos/templates/chronos/substitutions.html
@@ -1,3 +1,5 @@
+{# -*- engine:django -*- #}
+
 {% extends 'core/base.html' %}
 
 {% load i18n static %}
diff --git a/aleksis/apps/chronos/templates/chronos/substitutions_print.html b/aleksis/apps/chronos/templates/chronos/substitutions_print.html
index 4ce30f76ebc151dd0453aaaae29b864437f32749..9f30bd141cb846f71b88e5fb3cb6a9e766ecf271 100644
--- a/aleksis/apps/chronos/templates/chronos/substitutions_print.html
+++ b/aleksis/apps/chronos/templates/chronos/substitutions_print.html
@@ -1,3 +1,5 @@
+{# -*- engine:django -*- #}
+
 {% extends 'core/base.html' %}
 {% load common %}
 
diff --git a/aleksis/apps/chronos/templates/chronos/timetable.html b/aleksis/apps/chronos/templates/chronos/timetable.html
index d970904f7c593a6e325542c15d5efa3c65568c06..ef4c00bd73e5a3954cf3ef7d74aa9ee89a639fa5 100644
--- a/aleksis/apps/chronos/templates/chronos/timetable.html
+++ b/aleksis/apps/chronos/templates/chronos/timetable.html
@@ -1,3 +1,5 @@
+{# -*- engine:django -*- #}
+
 {% extends 'core/base.html' %}
 
 {% load data_helpers static i18n %}