diff --git a/MTUS-W9-adult-episodes-data-processing.Rmd b/MTUS-W9-adult-episodes-data-processing.Rmd
index e2fcecf97cea6a2ef386324ad4351ac602963ab6..b07459c4aa818fd031d344f4a35796e5a397d60a 100644
--- a/MTUS-W9-adult-episodes-data-processing.Rmd
+++ b/MTUS-W9-adult-episodes-data-processing.Rmd
@@ -689,7 +689,7 @@ ggplot(mtusUKEpsDT) +
 mtusUKEpsDT <- mtusUKEpsDT[, epDurationMins := (r_epEndTime - r_epStartTime)/60]
 
 ggplot(mtusUKEpsDT) +
-  geom_histogram(aes(x = epDurationMins)) +
+  geom_histogram(aes(x = epDurationMins), binwidth = 10) +
   facet_grid(survey ~ .) +
     labs(x = "Episode duration (minutes)", caption = "MTUS UK samples")