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+++ b/microkernel.mdwn
@@ -1,12 +1,15 @@
-[[!meta copyright="Copyright © 2007, 2008 Free Software Foundation, Inc."]]
+[[!meta copyright="Copyright © 2007, 2008, 2010 Free Software Foundation,
+Inc."]]
 
 [[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
 id="license" text="Permission is granted to copy, distribute and/or modify this
 document under the terms of the GNU Free Documentation License, Version 1.2 or
 any later version published by the Free Software Foundation; with no Invariant
 Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
-is included in the section entitled
-[[GNU Free Documentation License|/fdl]]."]]"""]]
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
+
+A *microkernel* is one kind of a [[kernel]] implementation.
 
 [[Liedtke]] explains in [On Microkernel Construction](http://l4ka.org/publications/paper.php?docid=642)
 that a microkernel attempts to minimize the mandatory part of the operating
@@ -19,12 +22,10 @@ The idea of a microkernel as explained above was first explored
 by Per Brinch-Hansen in 1970 in
 [The Nucleus of a Multiprogramming System](http://brinch-hansen.net/papers/1970a.pdf).
 
-Other notable microkernels include [[Hydra]], [[KeyKOS]], [[Eros]] and [[L4]].
-
 An [introduction](http://www.cs.cornell.edu/Info/People/ulfar/ukernel/ukernel.html) by 
 Úlfar Erlingsson and Athanasios Kyparlis (from 1996) to microkernel concepts.
 
-[[Research]].  [[Viengoos]].
+[[Research]].
 
 [[Microkernels_for_beginners|for_beginners]].
 
@@ -32,4 +33,21 @@ A 2002 article about [[microkernel_FUD|FUD]] (Fear, Uncertainty, Doubt).
 
 [[FAQ]].
 
-[[Mach]].
+
+# Implementations
+
+  * [[Hydra]]
+
+  * [[KeyKOS]]
+
+  * [[Mach]] -- used by the GNU/Hurd
+
+  * [[EROS]]
+
+  * [[CapROS]]
+
+  * [[Coyotos]]
+
+  * [[L4]]
+
+  * [[Viengoos]]