diff --git a/book-9-lesson-1.module b/book-9-lesson-1.module
index 6c4f965c..88c0e960 100644
--- a/book-9-lesson-1.module
+++ b/book-9-lesson-1.module
@@ -1540,6 +1540,7 @@ LINE: I think that these things make people happy because people enjoy having be
 # Source: LLA 1B Figure 5
 $SELECT What's the Main Idea?
 ID: 9-1b-f5
+REFERENCE: 9-1b-f5-story
 INTRO: For each paragraph you just heard, tap the statement that best gives the main idea — the big point, not just one detail from it.
 INSTRUCTION: Tap the main idea.