diff --git a/02_morphology_files/preposition.md b/02_morphology_files/preposition.md
index 9bd1fe38..0b819b32 100644
--- a/02_morphology_files/preposition.md
+++ b/02_morphology_files/preposition.md
@@ -8,7 +8,7 @@ A preposition does not change its form.
 ## More Information about this topic
 A preposition is often used with other words and these words are joined together to do something.
 
-* This group of words can function as an adjective,
+* This group of words can function as an adjective.
 * This group of words can function as a noun.
 * This group of words can function as an adverb.