diff --git a/doc/General/Acknowledgement.md b/doc/General/Acknowledgement.md
index 328a8f867..dca40023e 100644
--- a/doc/General/Acknowledgement.md
+++ b/doc/General/Acknowledgement.md
@@ -24,6 +24,7 @@ LibreNMS 3rd party acknowledgements
   - TW Sack (https://code.google.com/p/tw-sack/): GPLv3
   - Gridster (http://gridster.net/): MIT
   - Pure PHP radius class (http://developer.sysco.ch/php/): GPLv3
+  - GeSHi - Generic Syntax Highlighter (http://qbnz.com/highlighter/): GPLv2+
 
 #### 3rd Party GPLv3 Non-compliant