diff --git a/vignettes/composite-scores.Rmd b/vignettes/composite-scores.Rmd
index 836ce45f..921af202 100644
--- a/vignettes/composite-scores.Rmd
+++ b/vignettes/composite-scores.Rmd
@@ -28,7 +28,7 @@ sufficient.
 For instance, consider the case of a utility maximizing approach to
 planning where not a hard constraint on power but rather a trade-off betweem 
 power and expected sample size is required.
-The simplest utility function would just be a weightes sum of both
+The simplest utility function would just be a weighted sum of both
 power (negative weight since we minimize costs!) and expected
 sample size.