diff --git a/free-programming-books.md b/free-programming-books.md
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@@ -942,6 +942,7 @@
 
 * [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)