diff --git a/blog/systems.rst b/blog/systems.rst
index 0955e3d..e80c576 100644
--- a/blog/systems.rst
+++ b/blog/systems.rst
@@ -8,11 +8,18 @@ Books about systems
 
 Books I've read:
 
-* `Systemantics <https://en.wikipedia.org/wiki/Systemantics>`_
-* `Thinking In Systems <https://en.wikipedia.org/wiki/Thinking_In_Systems:_A_Primer>`_
+* `Systemantics <https://en.wikipedia.org/wiki/Systemantics>`_. Highly
+  recommend. This is "chicken soup for the system thinker's soul". The third
+  edition is called *The Systems Bible*.
+* `Thinking In Systems <https://en.wikipedia.org/wiki/Thinking_In_Systems:_A_Primer>`_.
+  Highly recommend. This is probably the best formal introduction to systems
+  thinking out there.
+* `The Fifth Discipline <https://en.wikipedia.org/wiki/The_Fifth_Discipline>`_.
+  Do not recommend. At least, not if "systems thinking" is your goal. Only 1
+  of the 4 or 5 parts is dedicated to systems thinking. The rest is business
+  leadership stuff.
 
 Books on my radar:
 
 * `Reckoning With Risk <https://www.amazon.com/0140297863>`_
-* `The Fifth Discipline <https://en.wikipedia.org/wiki/The_Fifth_Discipline>`_
 * `Doing It Differently <https://www.amazon.com/0727760823>`_