diff --git a/eldiego.pdf b/eldiego.pdf
index 08a670a..43f62f3 100644
Binary files a/eldiego.pdf and b/eldiego.pdf differ
diff --git a/preamble.tex b/preamble.tex
index 8a5a5e8..b72c324 100644
--- a/preamble.tex
+++ b/preamble.tex
@@ -10,8 +10,7 @@
 \usepackage{graphicx}
 \usepackage{wrapfig}
 \usepackage{amsmath}
-
-
+\usepackage{makeidx}
 
 %%% Margenes
 \setlength{\columnsep}{0.25in}    % default=10pt