diff --git a/wagtail/admin/staticfiles.py b/wagtail/admin/staticfiles.py
index 6d631d90f0..f973aa75b3 100644
--- a/wagtail/admin/staticfiles.py
+++ b/wagtail/admin/staticfiles.py
@@ -29,6 +29,7 @@ except AttributeError:
 
 
 if use_version_strings:
+    # SECRET_KEY is used to prevent exposing the Wagtail version
     VERSION_HASH = hashlib.sha1(
         (__version__ + settings.SECRET_KEY).encode("utf-8")
     ).hexdigest()[:8]
diff --git a/wagtail/admin/urls/__init__.py b/wagtail/admin/urls/__init__.py
index 74dc533314..8c31e7c49d 100644
--- a/wagtail/admin/urls/__init__.py
+++ b/wagtail/admin/urls/__init__.py
@@ -131,6 +131,7 @@ def get_sprite_hash():
     global sprite_hash
     if not sprite_hash:
         content = str(home.sprite(None).content, "utf-8")
+        # SECRET_KEY is used to prevent exposing the Wagtail version
         sprite_hash = hashlib.sha1(
             (content + settings.SECRET_KEY).encode("utf-8")
         ).hexdigest()[:8]