diff --git a/en:Glossary.md b/en:Glossary.md
index 0f1734f..16feb94 100644
--- a/en:Glossary.md
+++ b/en:Glossary.md
@@ -42,6 +42,10 @@ see [Tag](https://github.com/Ocelot-Social-Community/Ocelot-Social/wiki/en:Gloss
 
 Also called "hyperlink". A reference to a resource in the World Wide Web. This can be a website, a document, a video, an image, a sound or another kind of data file. Links are often underlined and appear in a different colour such as blue, so they can be recognised as such.
 
+## Open Source Software (OSS)
+
+Programming code that can be viewed, modified, shared and used. Open source licenses protect computer programs under copyright law and permit commercial use, for example in the form of professional support, training offers or consulting services. Ocelot.social is open source software.
+
 ## Post
 
 A published contribution.