diff --git a/app.py b/app.py
index b665919d169..cb7488a1c15 100644
--- a/app.py
+++ b/app.py
@@ -55,6 +55,7 @@
 from website.log_fetcher import log_fetcher
 from website.frontend_types import Adventure, Program, ExtraStory, SaveInfo
 from website.flask_hedy import g_db
+from website.newsletter import add_used_slides_to_subscription
 
 logConfig(LOGGING_CONFIG)
 logger = logging.getLogger(__name__)
@@ -2573,6 +2574,10 @@ def get_slides(level):
     if not SLIDES[g.lang].get_slides_for_level(level, keyword_language):
         return utils.error_page(error=404, ui_message="Slides do not exist!")
 
+    email = current_user().get('email')
+    if email:
+        add_used_slides_to_subscription(email)
+
     slides = SLIDES[g.lang].get_slides_for_level(level, keyword_language)
     return render_template('slides.html', level=level, slides=slides)
 
diff --git a/website/newsletter.py b/website/newsletter.py
index b41d21fbcd6..fe058ea8820 100644
--- a/website/newsletter.py
+++ b/website/newsletter.py
@@ -88,6 +88,10 @@ def add_class_customized_to_subscription(email):
     create_subscription_event(email, MailchimpTag.CUSTOMIZED_CLASS)
 
 
+def add_used_slides_to_subscription(email):
+    create_subscription_event(email, MailchimpTag.USED_SLIDES)
+
+
 @run_if_mailchimp_config_present
 def create_subscription_event(email, tag):
     """ When certain events occur, e.g. a newsletter subscriber creates or customizes a class, these events
@@ -126,6 +130,7 @@ class MailchimpTag:
     TEACHER = 'teacher'
     CREATED_CLASS = "created_class"
     CUSTOMIZED_CLASS = "customized_class"
+    USED_SLIDES = "used_slides"
 
 
 def create_mailchimp_subscriber(email, tag_names):