Update README.md

Author: rob-p

README.md

@@ -5,7 +5,7 @@ RapMap is a testing ground for ideas in quasi-mapping / (lightweight / pseudo) t
 Quasi-mapping / (lightweight / pseudo)-alignment is the term we are using here for the type of information required for certain tasks (e.g. 
 transcript quantification) that is less "heavyweight" than what is provided by traditional alignment. For example, one may
 only need to know the transcripts / contigs to which a read aligns and, perhaps, the position within those transcripts rather
-than the optimal alignment and base-for-base `CIGAR` string that aligns the read and substring of the transcript.  For details on RapMap (quasi-mapping in particular), please check out the [associated paper](http://bioinformatics.oxfordjournals.org/content/32/12/i192.full.pdf). Note: RapMap implements both quasi-mapping and pseudo-alignment (originally introduced in [kallisto](https://github.com/pachterlab/kallisto)), these two are not the same thing. They are distinct concepts, and RapMap simply happens to implement algorithms for computing both.
+than the optimal alignment and base-for-base `CIGAR` string that aligns the read and substring of the transcript.  For details on RapMap (quasi-mapping in particular), please check out the [associated paper](http://bioinformatics.oxfordjournals.org/content/32/12/i192.full.pdf). Note: RapMap implements both quasi-mapping and pseudo-alignment (originally introduced in [Bray et al. 2016](http://www.nature.com/nbt/journal/v34/n5/full/nbt.3519.html)), these two are not the same thing. They are distinct concepts, and RapMap simply happens to implement algorithms for computing both.
 
 There are a number of different ways to collect such information, and the idea of RapMap (as the repository grows) will be to explore multiple different strategies in how to most rapidly determine all *feasible* / *compatible* locations for a read within the transcriptome.  In this sense, it is like an *all-mapper*; the mappings it outputs are intended to be (eventually) disambiguated (*Really, it's more like an "all-best" mapper, since it returns all hits in the top "stratum" of quasi-mapping / (lightweight / pseudo)-alignments*).  If there is a need for it, *best-mapper* functionality may be added in the future.