diff --git a/pdf.c b/pdf.c
index 478b53ce633cd41848e5278b8857c8f9acf0033c..23cf121c93cbf2f07d6ddd74150de47f6180baf8 100644
--- a/pdf.c
+++ b/pdf.c
@@ -1243,7 +1243,7 @@ p_xrefdata__m(HAllocator *mm__, const Dict *dict)
 	 * entries /W, /Index, and /Size in the stream dictionary, a parser for
 	 * the cross-reference data itself.
 	 *
-	 * in short, every cross-reference entry consists of (as of PDF 1.7)
+	 * in short, every cross-reference entry consists of (as of PDF 2.0)
 	 * three fields, but it could be more. /W gives the widths (in bytes)
 	 * of these fields. the /Index specifies the division of the data into
 	 * subsections; it is an array of natural numbers that in pairs specify