diff --git a/data/interactive-description b/data/interactive-description
index a00405cf..5a06c580 100644
--- a/data/interactive-description
+++ b/data/interactive-description
@@ -14,6 +14,7 @@ gravity-force-lab
 gravity-force-lab-basics
 greenhouse-effect
 john-travoltage
+mean-share-and-balance
 models-of-the-hydrogen-atom
 molarity
 molecules-and-light