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-rw-r--r--ChangeLog5
-rw-r--r--math.c4
2 files changed, 7 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog
index 5dcaa58..d6b0286 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jan 12 13:53:17 2015 SHIBATA Hiroshi <shibata.hiroshi@gmail.com>
+
+ * math.c (math_atan2): improve documentation.
+ [Feature #10323][ruby-core:65400][ci skip]
+
Mon Jan 12 13:50:49 2015 SHIBATA Hiroshi <shibata.hiroshi@gmail.com>
* ext/bigdecimal/bigdecimal.c: fixes documentation like labeled lists,
diff --git a/math.c b/math.c
index 9aff663..20b3e77 100644
--- a/math.c
+++ b/math.c
@@ -37,8 +37,8 @@ VALUE rb_eMathDomainError;
* call-seq:
* Math.atan2(y, x) -> Float
*
- * Computes the arc tangent given +y+ and +x+.
- * Returns a Float in the range -PI..PI.
+ * Returns 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)
*