diff --git a/DESCRIPTION b/DESCRIPTION
index 098527b..d0f802c 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -32,6 +32,6 @@ Suggests:
     testthat (>= 3.0.0)
 Remotes:
     github::JGCRI/hector
-RoxygenNote: 7.2.3
+RoxygenNote: 7.3.1
 Config/testthat/edition: 3
 VignetteBuilder: knitr
diff --git a/R/multi_criteria_weighting.R b/R/multi_criteria_weighting.R
index f072ad4..9c18991 100644
--- a/R/multi_criteria_weighting.R
+++ b/R/multi_criteria_weighting.R
@@ -12,9 +12,9 @@
 #'
 #' @examples
 #' # Data frames representing scored ensemble using different scoring criterion
-#' score_df1 <- data.frame(weights = c(0.8, 0.6, 0.9))
-#' score_df2 <- data.frame(weights = c(0.7, 0.5, 0.8))
-#' score_df3 <- data.frame(weights = c(0.9, 0.8, 0.7))
+#' score_df1 <- data.frame(run_number = c(1, 2, 3), weights = c(0.8, 0.6, 0.9))
+#' score_df2 <- data.frame(run_number = c(1, 2, 3), weights = c(0.7, 0.5, 0.8))
+#' score_df3 <- data.frame(run_number = c(1, 2, 3), weights = c(0.9, 0.8, 0.7))
 #'
 #' # List of score data frames
 #' scores_list <- list(score_df1, score_df2, score_df3)
@@ -60,9 +60,12 @@ multi_criteria_weighting <- function(scores_list, criterion_weights = NULL) {
   # normalize the combined weights to sum to 1
   normalized_combined_scores <- combined_scores / sum(combined_scores)
 
+  # extract run_numbers from one of the data frames in scores_list
+  run_numbers <- scores_list[[1]]$run_number
+
   # return a df with run number and normalized multi-criteria weights
   return(data.frame(
-    run_number = 1:length(normalized_combined_scores),
+    run_number = run_numbers,
     mc_weight = normalized_combined_scores
   ))
 }
diff --git a/man/multi_criteria_weighting.Rd b/man/multi_criteria_weighting.Rd
index 735774c..42cd2f6 100644
--- a/man/multi_criteria_weighting.Rd
+++ b/man/multi_criteria_weighting.Rd
@@ -23,9 +23,9 @@ Weighting ensemble members using multiple criterion
 }
 \examples{
 # Data frames representing scored ensemble using different scoring criterion
-score_df1 <- data.frame(weights = c(0.8, 0.6, 0.9))
-score_df2 <- data.frame(weights = c(0.7, 0.5, 0.8))
-score_df3 <- data.frame(weights = c(0.9, 0.8, 0.7))
+score_df1 <- data.frame(run_number = c(1, 2, 3), weights = c(0.8, 0.6, 0.9))
+score_df2 <- data.frame(run_number = c(1, 2, 3), weights = c(0.7, 0.5, 0.8))
+score_df3 <- data.frame(run_number = c(1, 2, 3), weights = c(0.9, 0.8, 0.7))
 
 # List of score data frames
 scores_list <- list(score_df1, score_df2, score_df3)
diff --git a/tests/testthat/test-multi_criterion_weighting.R b/tests/testthat/test-multi_criterion_weighting.R
index d9d2695..7fa064c 100644
--- a/tests/testthat/test-multi_criterion_weighting.R
+++ b/tests/testthat/test-multi_criterion_weighting.R
@@ -1,7 +1,10 @@
 # Sample data
-score_df1 <- data.frame(weights = c(0.6, 0.4))
-score_df2 <- data.frame(weights = c(0.5, 0.5))
-score_df3 <- data.frame(weights = c(0.9, 0.1))
+score_df1 <- data.frame(run_number = c(1, 2),
+                        weights = c(0.6, 0.4))
+score_df2 <- data.frame(run_number = c(1, 2),
+                        weights = c(0.5, 0.5))
+score_df3 <- data.frame(run_number = c(1, 2),
+                        weights = c(0.9, 0.1))
 
 # Sample lists
 L1 <- list()