diff --git a/README.md b/README.md
index f59c24a..896be55 100644
--- a/README.md
+++ b/README.md
@@ -258,3 +258,4 @@ header files to use with documentation :<br />
    - [Partitioned Elias-Fano Indexes](http://www.di.unipi.it/~ottavian/files/elias_fano_sigir14.pdf)
    - [On Inverted Index Compression for Search Engine Efficiency](http://www.dcs.gla.ac.uk/~craigm/publications/catena14compression.pdf)
    - [Google's Group Varint Encoding](http://static.googleusercontent.com/media/research.google.com/de//people/jeff/WSDM09-keynote.pdf)
+