diff --git a/mkessler-operators.sty b/mkessler-operators.sty
index 05cef0c..16540a4 100644
--- a/mkessler-operators.sty
+++ b/mkessler-operators.sty
@@ -137,3 +137,4 @@
 \DeclareMathOperator{\Char}{char}
 \DeclareMathOperator{\res}{res}
 \DeclareMathOperator{\infl}{inf}
+\DeclareMathOperator{\cov}{cov}