diff --git a/res/cardsfolder/c/castigate.txt b/res/cardsfolder/c/castigate.txt
index 7c7323ba564..1c222bcb4e6 100644
--- a/res/cardsfolder/c/castigate.txt
+++ b/res/cardsfolder/c/castigate.txt
@@ -2,7 +2,7 @@ Name:Castigate
 ManaCost:W B
 Types:Sorcery
 Text:no text
-A:SP$ ChangeZone | Cost$ W B | Origin$ Hand | Destination$ Exile | ValidTgts$ Opponent | ChangeType$ Card.nonLand | ChangeNum$ 1 | IsCurse$ True | SpellDescription$ Target opponent reveals his or her hand. You choose a nonland card from it and exile that card.
+A:SP$ ChangeZone | Cost$ W B | Origin$ Hand | Destination$ Exile | ValidTgts$ Opponent | ChangeType$ Card.nonLand | ChangeNum$ 1 | IsCurse$ True | Mandatory$ True | SpellDescription$ Target opponent reveals his or her hand. You choose a nonland card from it and exile that card.
 SVar:Rarity:Common
 SVar:Picture:http://www.wizards.com/global/images/magic/general/castigate.jpg
 SetInfo:GPT|Common|http://magiccards.info/scans/en/gp/106.jpg