diff --git a/README.md b/README.md
index e8211d8..b851c1d 100644
--- a/README.md
+++ b/README.md
@@ -1640,8 +1640,8 @@ Equivalents to `Array`'s `.map(..)`, `.filter(..)` and `.reduce(..)` but return
 generators that yield the handler return values.
 
 <!--
-XXX doc all differences (revise)
 XXX .reduce(..) can return a non-iterable -- test and document this case...
+    ...compare with Array.prototype.reduce(..)
 -->
 
 
@@ -1654,15 +1654,11 @@ XXX .reduce(..) can return a non-iterable -- test and document this case...
     -> <generator>
 ```
 
-<!-- XXX -->
+Note that this does not support negative indexes as it not possible to know the
+generator length until it is fully done.
 
-
-<!-- XXX check this 
-This does not support negative indexes.
--->
-
-Equivalent to `Array`'s `.slice(..)` but will return a generator instead of an 
-array, for more info see:  
+Otherwise this is similar to `Array`'s `.slice(..)` but will return a generator 
+instead of an array, for more info see:  
 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice
 
 
diff --git a/generator.js b/generator.js
index b7d853c..df61912 100644
--- a/generator.js
+++ b/generator.js
@@ -180,7 +180,7 @@ object.Mixin('GeneratorProtoMixin', 'soft', {
 
 	// NOTE: this is different from Array's .slice(..) in that it does not 
 	// 		support negative indexes -- this is done because there is no way 
-	// 		to judge the length of a generator untill it is fully done...
+	// 		to judge the length of a generator until it is fully done...
 	slice: function*(from=0, to=Infity){
 		// sanity check...
 		if(from < 0 || to < 0){