diff --git a/Data/Abbr/mathematics.csv b/Data/Abbr/mathematics.csv
index efeaa507..b9255a1c 100644
--- a/Data/Abbr/mathematics.csv
+++ b/Data/Abbr/mathematics.csv
@@ -1,5 +1,5 @@
 ABBR,TERM
-AC,Axiom of Choice, or set of absolutely continuous functions.
+AC,"Axiom of Choice, or set of absolutely continuous functions."
 a.c.,absolutely continuous.
 acrd,inverse chord function.
 ad,adjoint representation (or adjoint action) of a Lie group.