diff --git a/tools/yersinia.md b/tools/yersinia.md
new file mode 100644
index 0000000..1ba4f47
--- /dev/null
+++ b/tools/yersinia.md
@@ -0,0 +1,51 @@
+# yersinia
+
+Notes
+-------
+
+Help Text
+-------
+```
+    ?????                                                                       
+   ????????                                                                     
+ ??????????                                                                     
+???????????????                                                                 
+????????????????                                                                
+?????????????????               Yersinia...                                     
+???????????????????                                                             
+?????????????????????         The Black Death for nowadays networks             
+ ???????????????????????                                                        
+ ???????????????????????             by Slay & tomac                            
+  ???????????????????????                                                       
+     ??????????????????????        http://www.yersinia.net                      
+      ?????????????????????            yersinia@yersinia.net                    
+       ????????????????????                                                     
+         ??????????????????                                                     
+         ?????????????????     Prune your MSTP, RSTP, STP trees!!!!             
+             ??????????????                                                     
+
+
+Usage: yersinia [-hVGIDd] [-l logfile] [-c conffile] protocol [protocol_options]
+       -V   Program version.
+       -h   This help screen.
+       -G   Graphical mode (GTK).
+       -I   Interactive mode (ncurses).
+       -D   Daemon mode.
+       -d   Debug.
+       -l logfile   Select logfile.
+       -c conffile  Select config file.
+  protocol   One of the following: cdp, dhcp, dot1q, dot1x, dtp, hsrp, isl, stp, vtp.
+
+Try 'yersinia protocol -h' to see protocol_options help
+
+Please, see the man page for a full list of options and many examples.
+Send your bugs & suggestions to the Yersinia developers <yersinia@yersinia.net>
+
+```
+
+Example Usage
+-------
+
+Links
+-------
+
diff --git a/vulnanalysis/index.md b/vulnanalysis/index.md
index 583a9b2..9d1141b 100644
--- a/vulnanalysis/index.md
+++ b/vulnanalysis/index.md
@@ -5,9 +5,9 @@ Cisco Tools
 
  * [cisco-auditing-tool](../tools/CAT.md)
  * [cisco-global-exploiter] (../tools/cge.pl.md)
- * [cisco-ocs]
+ * [cisco-ocs](../tools/ocs.md)
  * [cisco-torch](../tools/cisco-torch.md)
- * [yersinia]
+ * [yersinia](../tools/yersinia.md)
 
 Database Assessment
 -------------------