1 files changed, 1 insertions, 1 deletions
diff --git a/math.c b/math.c
index 60dd0b7204..813e38c7e7 100644
--- a/math.c
+++ b/math.c
@@ -136,7 +136,7 @@ math_acos(obj, x)
  *  call-seq:
  *     Math.asin(x)    => float
  *  
- *  Computes the arc sine of <i>x</i>. Returns 0..PI.
+ *  Computes the arc sine of <i>x</i>. Returns -{PI/2} .. {PI/2}.
  */
 
 static VALUE