diff --git a/data/android b/data/android
index 6d2f2ec9..e642185e 100644
--- a/data/android
+++ b/data/android
@@ -1,3 +1,6 @@
+# All .android domains
+android
+
 android.com
 androidify.com
 
diff --git a/data/cbs b/data/cbs
index 6222aaaa..b3546582 100644
--- a/data/cbs
+++ b/data/cbs
@@ -1,8 +1,8 @@
-# All .cbs domains
-cbs
+# https://www.iana.org/domains/root/db/cbs.html
+# cbs (Revoked)
 
-# All .showtime domains
-showtime
+# https://www.iana.org/domains/root/db/showtime.html
+# showtime (Revoked)
 
 cbs.com
 cbscorporation.com
diff --git a/data/google b/data/google
index fb75d55e..21df672a 100644
--- a/data/google
+++ b/data/google
@@ -21,7 +21,7 @@ include:v8
 include:youtube
 
 # All .and domains
-and
+# and (TLD application withdrawn by Google)
 
 # All .chrome domains
 chrome
diff --git a/data/mcdonalds b/data/mcdonalds
index 2784ac31..24da7960 100644
--- a/data/mcdonalds
+++ b/data/mcdonalds
@@ -1,8 +1,8 @@
-# All .mcd domains
-mcd
+# https://www.iana.org/domains/root/db/mcd.html
+# mcd (Revoked)
 
-# All .mcdonalds domains
-mcdonalds
+# https://www.iana.org/domains/root/db/mcdonalds.html
+# mcdonalds (Revoked)
 
 # McDonald's Australia
 happymeal.com.au
diff --git a/data/theguardian b/data/theguardian
index f72a732d..d39fc02c 100644
--- a/data/theguardian
+++ b/data/theguardian
@@ -1,5 +1,5 @@
 # All .theguardian domains
-theguardian
+# theguardian (never delegated)
 
 dev-guardianapis.com
 dev-theguardian.com