--- ext/bigdecimal/bigdecimal.c	2014-12-06 14:28:15.000000000 +0100
+++ ext/bigdecimal/bigdecimal.c	2014-12-06 19:26:03.000000000 +0100
@@ -1664,10 +1664,12 @@
 /* call-seq:
  * round(n, mode)
  *
- * Round to the nearest 1 (by default), returning the result as a BigDecimal.
+ * Round to the nearest integer (by default), returning the result as a
+ * BigDecimal.
  *
  *	BigDecimal('3.14159').round #=> 3
  *	BigDecimal('8.7').round #=> 9
+ *	BigDecimal('-9.9').round #=> -10
  *
  * If n is specified and positive, the fractional part of the result has no
  * more than that many digits.
@@ -1725,10 +1727,12 @@
 /* call-seq:
  * truncate(n)
  *
- * Truncate to the nearest 1, returning the result as a BigDecimal.
+ * Truncate to the nearest integer (by default), returning the result as a
+ * BigDecimal.
  *
  *	BigDecimal('3.14159').truncate #=> 3
  *	BigDecimal('8.7').truncate #=> 8
+ *	BigDecimal('-9.9').truncate #=> -9
  *
  * If n is specified and positive, the fractional part of the result has no
  * more than that many digits.