diff --git a/mkessler-operators.sty b/mkessler-operators.sty
index 0096fc9..6434bc1 100644
--- a/mkessler-operators.sty
+++ b/mkessler-operators.sty
@@ -142,4 +142,6 @@
 \DeclareMathOperator{\ord}{ord}
 \DeclareMathOperator{\tg}{tg}
 \DeclareMathOperator{\Ver}{Ver}
+\DeclareMathOperator{\inv}{inv}
+