Update README.md

README.md

@@ -18,6 +18,8 @@ author = {Luca Renders and Kathleen Marchal and Jan Fostier},
 keywords = {Algorithms, Bioinformatics, Computer science, High-performance computing in bioinformatics},
 ```--->
 
+**Important:** To use Nexus v1.1.0 instead of v1.0.0, the index must be rebuilt. 
+
 These instructions will get you a copy of the project up and running on your local machine.
 
 #  Prerequisites
@@ -804,4 +806,4 @@ To reproduce the strain-free results from Figure 3, run Nexus with checkpoint sp
 Do this for `[cp] = {8,16,...,16384 and none}`.
 
 Runtime is reported as `Total duration`.
-The memory usage of node identifier mapping `IDmapping_right` can be found by inspecting the `basefile.right.map.[cp]` file size. -->
+The memory usage of node identifier mapping `IDmapping_right` can be found by inspecting the `basefile.right.map.[cp]` file size. -->