diff --git a/app/models/activity.rb b/app/models/activity.rb
index 2698fa28e..6ca3d0731 100644
--- a/app/models/activity.rb
+++ b/app/models/activity.rb
@@ -390,17 +390,21 @@ def activity_url
     return "https://koala.svsticky.nl/activities/#{ id }"
   end
 
+  # The description of the activity in the specified locale
   def description_localised(locale)
     return locale == :nl ? description_nl : description_en
   end
 
   # This generates an URL representing a calendar activity template, filled with data from the koala activity
-  def google_event(loc = nil)
+  def google_event(locale = nil)
     return nil if start.nil? || self.end.nil?
 
-    loc = I18n.locale if loc.nil?
-    disclaimer = "[#{ I18n.t('activerecord.attributes.activity.disclaimer') }]"
-    description = "#{ activity_url }\n\n#{ description_localised(loc) }\n\n#{ disclaimer }"
+    locale = I18n.locale if locale.nil?
+
+    disclaimer = "[#{ I18n.t('activerecord.attributes.activity.disclaimer', deep_interpolation: true,
+                                                                            datetime: DateTime.current.utc.to_s) }]"
+    description = "#{ activity_url }\n\n#{ description_localised(locale) }\n\n#{ disclaimer }"
+
     uri_name = URI.encode_www_form_component(name)
     uri_description = URI.encode_www_form_component(description)
     uri_location = URI.encode_www_form_component(location)
@@ -442,7 +446,7 @@ def gen_time_string(loc)
     return fmt_dt.call(start_date) + fmt_tm.call(start_time) + edt
   end
 
-  # Converts a sticky activity to an iCalendar event
+  # Converts a Sticky activity to an iCalendar event
   def to_calendar_event(locale)
     event = Icalendar::Event.new
     event.uid = id.to_s
@@ -458,7 +462,9 @@ def to_calendar_event(locale)
     end
 
     event.summary = name
-    event.description = description_localised(locale)
+    event.description = "#{ activity_url }\r\n\r\n\
+      #{ description_localised(locale) }\r\n\r\n\
+      Last synced on: #{ DateTime.current.utc }"
     event.location = location
     return event
   end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 244bbcea2..de7a005b0 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -33,7 +33,7 @@ en:
         description: Description
         description_en: English description
         description_nl: Dutch description
-        disclaimer: Data on this activity may be outdated, as it was added as a one-time copy of the information given at that time. Up-to-date info can be found on Koala.
+        disclaimer: Data about this activity has been added as a one-time copy from what was known on %{datetime}, and as such could be outdated.
         end_date: Enddate
         end_time: Endtime
         google_event: Copy once to calendar
diff --git a/config/locales/members.en.yml b/config/locales/members.en.yml
index 09c8c4e6f..39dea5c5a 100644
--- a/config/locales/members.en.yml
+++ b/config/locales/members.en.yml
@@ -19,7 +19,7 @@ en:
       calendar:
         confirm_understand_icalendar:
           confirm: I understand
-          text: Koala will maintain the icalendar feed you just copied, at all times. However, koala is only aware of activities for which you are enrolled through koala, and not through some other platform (like Pretix or a Google form). Remember to add those activities to your calendar manually.
+          text: Koala will maintain the icalendar feed you just copied to your clipboard, at all times. However, koala is only aware of activities for which you are enrolled through koala, and not through some other platform (like Pretix or a Google form). Remember to add those activities to your calendar manually.
           title: Warning
       error:
         edit: Could not edit!
diff --git a/config/locales/members.nl.yml b/config/locales/members.nl.yml
index 574009a73..6759d4eda 100644
--- a/config/locales/members.nl.yml
+++ b/config/locales/members.nl.yml
@@ -19,7 +19,7 @@ nl:
       calendar:
         confirm_understand_icalendar:
           confirm: Ik begrijp het
-          text: Koala zal de icalendar feed die je zojuist hebt gekopieerd te allen tijde bijwerken. Echter, is koala alleen op de hoogte van activiteiten waarvoor je je via Koala hebt ingeschreven, en niet via een ander platform (zoals Pretix of een Google Form). Vergeet niet om die activiteiten handmatig aan je agenda toe te voegen.
+          text: Koala zal de icalendar feed die je zojuist hebt gekopieerd naar je klembord ten aller tijde bijwerken. Echter, is koala alleen op de hoogte van activiteiten waarvoor je je via Koala hebt ingeschreven, en niet via een ander platform (zoals Pretix of een Google Form). Vergeet niet om die activiteiten handmatig aan je agenda toe te voegen.
           title: Waarschuwing
       error:
         edit: Kon niet bijwerken!
diff --git a/config/locales/nl.yml b/config/locales/nl.yml
index 88bfa06ee..84935bd1a 100644
--- a/config/locales/nl.yml
+++ b/config/locales/nl.yml
@@ -33,7 +33,7 @@ nl:
         description: Beschrijving
         description_en: Engelse beschrijving
         description_nl: Nederlandse beschrijving
-        disclaimer: Gegevens in deze afspraak kunnen outdated zijn, omdat deze waren toegevoegd als een eenmalig kopie van wat toen bekend was. Up-to-date informatie staat op Koala.
+        disclaimer: Gegevens over deze activiteit zijn toegevoegd als een eenmalig kopie van wat bekend was op %{datetime}, en kunnen dus verouderd zijn.
         end_date: Einddatum
         end_time: Eindtijd
         google_event: Kopiëer eenmalig naar agenda