1 files changed, 3 insertions, 1 deletions
diff --git a/doop.c b/doop.c
index 23662d7f2c..cd9b3b4f17 100644
--- a/doop.c
+++ b/doop.c
@@ -9,7 +9,9 @@
  */
 
 /*
- * "'So that was the job I felt I had to do when I started,' thought Sam."
+ *  'So that was the job I felt I had to do when I started,' thought Sam.
+ *
+ *     [p.934 of _The Lord of the Rings_, VI/iii: "Mount Doom"]
  */
 
 /* This file contains some common functions needed to carry out certain