diff --git a/docs/andreas_general.bib b/docs/andreas_general.bib
index 8d5f7da..0be37ca 100644
--- a/docs/andreas_general.bib
+++ b/docs/andreas_general.bib
@@ -149,3 +149,12 @@
 	year = {2018},
 }
 
+@misc{dia,
+	month = {{02}},
+	note = {{\url{http://dia-installer.de/}}},
+	Urldate = {{2018-02-06}},
+	author = {Macke, Steffen},
+	title = {{Dia draws your structured diagrams: Free Windows, Mac OS X and Linux version of the popular open source program}},
+	year = {2018},
+}
+