diff --git a/mrk/09/20.md b/mrk/09/20.md
index 9a869e0649..d8635c7fd8 100644
--- a/mrk/09/20.md
+++ b/mrk/09/20.md
@@ -4,5 +4,5 @@ This refers to the unclean spirit. See how you translated this in [Mark 9:17](..
 
 # convulsion
 
-This is a condition where a person has no control over his body, and his body shakes violently.
+This is the violent shaking of a person's body that can occur when that person has no control over his body.