docs: format

Author: V-Francois

validation/lj-mixture/README.md

@@ -22,8 +22,12 @@ The script will run simulations at all desired parameters, save the results to c
 ## Results
 
 ParticleMC reproduces published results very well:
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 ![correlation-plot](correlation-plot.jpeg)
 
+On this plot, `x` is the ratio between the two types of particles, and the energy is per particle.
+
 For some setups, the energies from ParticleMC are a bit higher than published ones. This actually happens at low density, because the simulation times are too short and we don't reach proper convergence (timeseries of energies not shown).
 
 ## Reference data