diff --git a/packages/macros.sty b/packages/macros.sty
index 6edf20a..11fcbb2 100644
--- a/packages/macros.sty
+++ b/packages/macros.sty
@@ -67,6 +67,7 @@
 \newcommand{\powerset}[1]{\mathcal{P}(#1)} % Power set
 \newcommand{\converges}{\rightarrow}
 \DeclareMathOperator{\equivalence}{\Longleftrightarrow}
+\newcommand{\notimplies}{\mathrel{{\ooalign{\hidewidth$\not\phantom{=}$\hidewidth\cr$\implies$}}}}
 \DeclareMathOperator{\Limplies}{\Longleftarrow}
 \newcommand{\impliespart}{\fbox{$\implies$}}
 \newcommand{\Limpliespart}{\fbox{$\Limplies$}}