diff --git a/database/catalog-nk.yml b/database/catalog-nk.yml
index 56ec1cea..b0beaab6 100644
--- a/database/catalog-nk.yml
+++ b/database/catalog-nk.yml
@@ -2370,7 +2370,6 @@
     - BOOK: Tb3Ga5O12
       name: "Tb<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> (Terbium gallium garnet, TGG)"
       info: main/Tb3Ga5O12.html
-      content:
       content:
         - PAGE: Schlarb
           name: "Schlarb and Sugg 1994: n 0.405–1.18 µm"