diff --git a/docs/begrippen.md b/docs/begrippen.md
index 0578254..4e3cf78 100644
--- a/docs/begrippen.md
+++ b/docs/begrippen.md
@@ -19,6 +19,7 @@
 * DHT11
 * LDR
 * IDE
+* DOM - Document object model
 * TLA - three letter acronym 
 ---