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-rw-r--r--math.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/math.c b/math.c
index 20b3e77..7c18f07 100644
--- a/math.c
+++ b/math.c
@@ -37,7 +37,9 @@ VALUE rb_eMathDomainError;
* call-seq:
* Math.atan2(y, x) -> Float
*
- * Returns a angle in radians between the positive x-axis of cartesian plane
+ * Computes the arc tangent given +y+ and +x+.
+ * Returns a Float in the range -PI..PI. Return value is a angle
+ * in radians between the positive x-axis of cartesian plane
* and the point given by the coordinates (+x+, +y+) on it.
*
* Domain: (-INFINITY, INFINITY)