diff --git a/plots/correlation_figure.m b/plots/correlation_figure.m
index 77cf776..90beaff 100644
--- a/plots/correlation_figure.m
+++ b/plots/correlation_figure.m
@@ -183,7 +183,7 @@
     'yielding a <i>N</i><sub>features x references</sub> x <i>N</i><sub>features x references</sub> '...
     'correlation matrix for each patient, where <i>N</i><sub>features x references</sub> is the '...
     'number of features times the number of references (30 x 3 = 90). Fig. S1A shows the '...
-    'average inter-feature correlation matrix across patients for a single choice of reference (common average). '...
+    'average inter-feature correlation matrix across patients for a single choice of reference (common average), and in sleep. '...
     'There were often high correlations between different frequency band measurements of the same feature. '... ...
     'There were also often high correlations or anti-correlations between different features, such as between '...
     'coherence and phase-locking value, and between coherence and relative entropy (negative correlation).'...