diff --git a/src/core/index.sty b/src/core/index.sty
index 122f4df..65d4418 100644
--- a/src/core/index.sty
+++ b/src/core/index.sty
@@ -10,6 +10,7 @@
 }
 
 \newcommand{\addIndexBold}[1]{\textbf{\index{\MakeLowercase{#1}} #1}}
+\newcommand{\addIndexBI}[1]{\textbf\textit{{\index{\MakeLowercase{#1}} #1}}}
 \newcommand{\addIndexItalic}[1]{\textit{\index{\MakeLowercase{#1}} #1}}
 \newcommand{\addIndex}[1]{\index{\MakeLowercase{#1}} #1}