diff --git a/doc-tools-check-languages.conf b/doc-tools-check-languages.conf
index 8839118a5..065e870c8 100644
--- a/doc-tools-check-languages.conf
+++ b/doc-tools-check-languages.conf
@@ -19,13 +19,11 @@ declare -A DIRECTORIES=(
 declare -A BOOKS=(
     # See comment at start of file and update tox.ini as well if you
     # change anything here.
-    ["de"]="api-quick-start"
+    ["de"]="api-quick-start firstapp"
     ["id"]="api-quick-start"
     ["ja"]="api-quick-start"
     ["ko_KR"]="api-quick-start"
     ["zh_CN"]="api-quick-start"
-    # TODO(jaegerandi): Enable sync of common translations once
-    # there are translated firstapp guides.
 )