diff --git a/pdf/pdf-notes b/pdf/pdf-notes
index 9b6a1fff8a5181daaf5f79f2867f27cce12273b9..1e72b806eec3bbb8ba7585753db1f849a46f6370 100644
--- a/pdf/pdf-notes
+++ b/pdf/pdf-notes
@@ -84,7 +84,7 @@ Annotations: (section 8.4, page 604)
 page -> /Annots -> array of annotation dictionaries
 
 	/Type /Annot		optional
-	/SubType xxx
+	/Subtype xxx
 	/Rect [rectangle]	location on page
 	/Contents (string)
 	/P -> page containing this annot