diff --git a/README.md b/README.md
index 7de83e4dcd3111451f999acc49c63b862186fba4..a2602a3d7441d0338870e837cf9ed47e4a73779a 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ This repository contains the code used in the paper:
 Lun Cui, Antoine Vigouroux, Francois Rousset, Hugo Varet, Varun Khanna & David Bikard
 
 
-In this study We designed a library of 84215 unique guide RNAs targeting random positions 
+In this study we designed a library of 84215 unique guide RNAs targeting random positions 
 along the genome of E. coli MG1655, with the simple requirement of a “NGG” PAM. The library 
 contains an average of 19 targets per gene. A pool of guide RNAs obtained through on-chip 
 oligo synthesis was cloned under the control of a constitutive promoter on plasmid psgRNA