diff --git a/g4521-g4530/g4521.md b/g4521-g4530/g4521.md
index 572e8e4b..a9202560 100644
--- a/g4521-g4530/g4521.md
+++ b/g4521-g4530/g4521.md
@@ -3,3 +3,4 @@ This word is a type of thing or idea. It is a noun.
 
 * This word can mean Sabbath. The sabbath is the seventh day of the week. It began at sunset on Friday and ended at sunset on Saturday. In the law of Moses, God commanded the people of Israel to rest on this day. 
 * This word can mean a week or seven days. 
+* Sometimes this word is used in its plural form, even when it refers to one Sabbath day.