diff --git a/acronyms.tex b/acronyms.tex
index 8e4c836..67ad8f1 100644
--- a/acronyms.tex
+++ b/acronyms.tex
@@ -74,6 +74,7 @@
 \newacronym{rstp}{RSTP}{Rapid Spanning Tree Protocol}
 \newacronym{rpvst}{RPVST}{Rapid Per Vlan Spanning Tree}
 \newacronym{rpvst+}{RPVST+}{Rapid Per Vlan Spanning Tree Plus}
+\newacronym{sdm}{SDM}{Security Device Manager}
 \newacronym{sdsl}{SDSL}{Symmetric Digital Subscriber Line}
 \newacronym{sftp}{SFTP}{Secure Shell File Transfer Protocol}
 \newacronym{sla}{SLA}{Service Level Agreement}