diff --git a/ChangeLog b/ChangeLog
index c1b43629f9..d81358b7ee 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Mon Jul 15 11:10:46 2013  Zachary Scott  <e@zzak.io>
+
+	* bignum.c (rb_big_coerce): [DOC] Add docs for Bignum#coerce
+	  Based on patch by Juanito Fatas [Fixes GH-360]
+	  https://github.com/ruby/ruby/pull/360
+
 Mon Jul 15 10:56:01 2013  Zachary Scott  <e@zzak.io>
 
 	* thread.c (mutex_sleep): [DOC] Awake thread will reacquire lock
diff --git a/bignum.c b/bignum.c
index d9120f8e61..5cbd80f5c5 100644
--- a/bignum.c
+++ b/bignum.c
@@ -5898,7 +5898,17 @@ rb_big_hash(VALUE x)
 }
 
 /*
- * MISSING: documentation
+ * call-seq:
+ *   big.coerce(numeric)  ->  array
+ *
+ * Returns an array with both a +numeric+ and a +big+ represented as Bignum
+ * objects.
+ *
+ * This is achieved by converting +numeric+ to a Bignum.
+ *
+ * A TypeError is raised if the +numeric+ is not a Fixnum or Bignum type.
+ *
+ *     (0x3FFFFFFFFFFFFFFF+1).coerce(42)   #=> [42, 4611686018427387904]
  */
 
 static VALUE