diff --git a/de.prob.ui/plugin.xml b/de.prob.ui/plugin.xml
index 7b7824cbf86fdddecbb7aae45437d2838e625717..ce2c41a1870fcd179a74b3b69b706ba96b600c32 100644
--- a/de.prob.ui/plugin.xml
+++ b/de.prob.ui/plugin.xml
@@ -1202,6 +1202,7 @@
             expandsHorizontally="true"
             id="de.prob.ui.unitPragma"
             isMath="true"
+            prefix="Physical Unit:"
             style="de.prob.ui.unitPragma"
             typeId="de.prob.core.unitPragma">
       </textAttribute>