diff --git a/include/int_div.h b/include/int_div.h
index 480bc4f9cd05d304724b32dfa0af7d87cba60600..9092822eae55a20d85e0fa17b2ad77e23df29802 100644
--- a/include/int_div.h
+++ b/include/int_div.h
@@ -6,7 +6,7 @@
   The method uses a basis b=1200 representation for time spans and the
   division algorithm explained in
 
-  P. B. Hansen: Multiple-Length Division Revisited: A Tour of the Minefield (192)
+  P. B. Hansen: Multiple-Length Division Revisited: A Tour of the Minefield (1992)
                 Electrical Engineering and Computer Science Technical Reports. 166.
 */
 
diff --git a/src/int_div.c b/src/int_div.c
index b947fabc56cfc414f51f21a8c9e8419a8e6e0ea0..1373ef3448b1bc49321121bb9cb2a5011d3be87d 100644
--- a/src/int_div.c
+++ b/src/int_div.c
@@ -6,7 +6,7 @@
   The method uses a basis b=1200 representation for time spans and the
   division algorithm explained in
 
-  P. B. Hansen: Multiple-Length Division Revisited: A Tour of the Minefield (192).
+  P. B. Hansen: Multiple-Length Division Revisited: A Tour of the Minefield (1992).
                 Electrical Engineering and Computer Science Technical Reports. 166.
 */
 #include "int_div.h"