diff --git a/content/reviews/books/21st-century-robot.md b/content/reviews/books/21st-century-robot.md
index 2fd48d5..be8f083 100644
--- a/content/reviews/books/21st-century-robot.md
+++ b/content/reviews/books/21st-century-robot.md
@@ -3,7 +3,8 @@ title = "21st Century Robot: The Dr. Simon Egerton Stories - Brian David Johnson
 date = 2020-07-04
 
 [taxonomies]
-tags = ["books", "reviews", "david johnson", "robotics", "it", "2 stars"]
+tags = ["books", "reviews", "david johnson", "robotics", "it", "2 stars",
+"2020 challenge"]
 +++
 
 [GoodReads Summary](https://www.goodreads.com/book/show/16087659-21st-century-robot):
diff --git a/content/reviews/books/introducing-elixir.md b/content/reviews/books/introducing-elixir.md
new file mode 100644
index 0000000..807a0ab
--- /dev/null
+++ b/content/reviews/books/introducing-elixir.md
@@ -0,0 +1,31 @@
++++
+title = "Introducing Elixir: Getting Started in Functional Programming - Simon St.Laurent, J. David Eisenberg"
+date = 2020-07-24
+
+[taxonomies]
+tags = ["books", "reviews", "simon st laurent", "j david eisenberg", "it",
+"elixir", "2020 challenge", "4 stars"]
++++
+
+[GoodReads Summary](https://www.goodreads.com/book/show/18194084-introducing-elixir):
+Authors Simon St. Laurent and J. David Eisenberg show you how to write simple
+Elixir programs by teaching you one skill at a time. You'll learn about
+pattern matching, recursion, message passing, process-oriented programming,
+and establishing pathways for data rather than telling it where to go. By the
+end of your journey, you'll understand why Elixir is ideal for concurrency and
+resilience.
+
+<!-- more -->
+
+{{ stars(stars=4) }}
+
+In a way, this is an "Introducing" book, so one shouldn't expect some deep
+knowledge about the language after reading it.  But also, sometimes it feels a
+bit too "shallow" to gather some proper understanding of the language. 
+
+One thing that kept bugging me was the fact that code kept changing: Not in
+the "going forward" kind of change, which is good, explain the basic, then
+start adding more complex/shorter solutions, but "let me bend this to another
+direction and completely ignore that direction later".
+
+But to get a "feeling" of the language, it is a good book.