Installation.md

 # File format #
 
-Metagenomics samples must be stored in a unique directory. Because there is a high variability in filename format increasing automated paired-end data recognition, filename are constrained and must respect the following format :
+Metagenomics samples must be stored in a unique directory. Because there is a high variability in filename format, the difficulty to automatise paired-end data recognition increase. Filename are constrained and must respect the following format :
 
     <sample_name>(. | _)(r1 | R1 | r2 | R2)(fastq | fq | fastq.gz | fq.gz)