diff --git a/systems/jobad.md b/systems/jobad.md
index 55bdbdb2cf7ae52b94a8719159614b830852f870..0f55d8412cc89227fcc8f1dff35e2be00033aecc 100644
--- a/systems/jobad.md
+++ b/systems/jobad.md
@@ -5,6 +5,7 @@ title: JOBAD
 teaser: A Javascrip Framework for instrumenting Active Documents with Semantic Services
 
 start_date: 2008-09
+oprhan: true
 
 people: 
     - frabe
diff --git a/systems/mws.md b/systems/mws.md
index 3a71eedbda9319f759f4525b42fca396c18cb36a..3aaad2ccebb892698d178cf3d46bf92331458612 100644
--- a/systems/mws.md
+++ b/systems/mws.md
@@ -6,7 +6,7 @@ title: MathWebSearch
 teaser: A Mathematical Search Engine
 
 start_date: '2005'
-
+orphan: true
 people: 
     - mkohlhase
     - isucan
diff --git a/systems/openmathmap.md b/systems/openmathmap.md
index 19d77fb0dd3097aed3139f3e37a060dcff81078f..c7be2dd018fe6a353f92f3df54659c5318a48690 100644
--- a/systems/openmathmap.md
+++ b/systems/openmathmap.md
@@ -6,6 +6,7 @@ teaser: A Map of Mathematics
 
 start_date: 2013-06 
 end_date: 2015-06 
+orphan: true
 
 people:
     - mkohlhase
diff --git a/systems/sally.md b/systems/sally.md
index e60c015bf690c27a4a821fb5e12754aa2bc1382b..8d553802ab760ef177a6ddc4fc6737ba6b34231d 100644
--- a/systems/sally.md
+++ b/systems/sally.md
@@ -5,6 +5,7 @@ title: Semantic Alliance
 teaser: A framework for mashing up semantic services into desktop applications.
 
 start_date: 2013-02
+orphan: true
 
 people: 
     - mkohlhase