diff --git a/notes/rabia.md b/notes/rabia.md
index ec073c8ed97e9e562a61dd38d35d2735b42c8996..2a696bbb2409e7b6f77c3e34aef2379de5df32f3 100644
--- a/notes/rabia.md
+++ b/notes/rabia.md
@@ -26,7 +26,7 @@ Claims are that:
 
 Definitions:
 - *weak validity:* choose either value proposed by client or NULL
-  ($\bottom$) ($$\bottom$$)
+  ($\bot) ($$\bot$$)
 
 Challenges:
 - staying on fast path whenever possible