From db0c3b8bde57de0bd5d3666841e06f37a19d4a43 Mon Sep 17 00:00:00 2001
From: Carlos Rocha <MoiRouhs@users.noreply.github.com>
Date: Sat, 21 Jan 2017 13:48:46 -0500
Subject: [PATCH] new publication about crystal (#2238)

---
 free-programming-books.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/free-programming-books.md b/free-programming-books.md
index b8aab2ac..7c0f76df 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -26,6 +26,7 @@
 * [ColdFusion](#coldfusion)
 * [Cool](#cool)
 * [Coq](#coq)
+* [Crystal](#crystal)
 * [CUDA](#cuda)
 * [D](#d)
 * [Dart](#dart)
@@ -936,6 +937,10 @@
 * [Software Foundations](http://www.cis.upenn.edu/~bcpierce/sf/)
 
 
+### Crystal
+
+*[Crystal for Rubyists.](http://www.crystalforrubyists.com)
+
 ### CUDA
 
 * [OpenCL Programming Guide for CUDA Architecture](http://www.nvidia.com/content/cudazone/download/OpenCL/NVIDIA_OpenCL_ProgrammingGuide.pdf) (PDF)
-- 
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