diff --git a/configure_dms_viz/configure_dms_viz.py b/configure_dms_viz/configure_dms_viz.py
index bc69ace..1e2f758 100755
--- a/configure_dms_viz/configure_dms_viz.py
+++ b/configure_dms_viz/configure_dms_viz.py
@@ -618,23 +618,25 @@ def make_experiment_dictionary(
         if included_chains != "polymer":
             check_chains(get_structure(structure), included_chains.split(" "))
         # Check that the wildtype residues are in the structure
-        perc_matching, perc_missing = check_wildtype_residues(
-            get_structure(structure), mut_metric_df, sitemap_df, excluded_chains
+        perc_matching, perc_missing, count_matching, count_missing = (
+            check_wildtype_residues(
+                get_structure(structure), mut_metric_df, sitemap_df, excluded_chains
+            )
         )
         # Alert the user about the missing and matching residues
         if perc_matching < 0.5:
             color = "red"
-            message = f"Warning: Fewer than {perc_matching*100:.2F}% of the wildtype residues in the data match the corresponding residues in the structure."
+            message = f"Warning: Fewer than {perc_matching*100:.2F}% {count_matching} of the wildtype residues in the data match the corresponding residues in the structure."
         else:
             color = "yellow"
-            message = f"About {perc_matching*100:.2F}% of the wildtype residues in the data match the corresponding residues in the structure."
+            message = f"About {perc_matching*100:.2F}% {count_matching} of the wildtype residues in the data match the corresponding residues in the structure."
         click.secho(message=message, fg=color)
         if perc_missing >= 0.5:
             color = "red"
-            message = f"Warning: {perc_missing*100:.2F}% of the data sites are missing from the structure."
+            message = f"Warning: {perc_missing*100:.2F}% {count_missing} of the data sites are missing from the structure."
         else:
             color = "yellow"
-            message = f"About {perc_missing*100:.2F}% of the data sites are missing from the structure."
+            message = f"About {perc_missing*100:.2F}% {count_missing} of the data sites are missing from the structure."
         click.secho(message=message, fg=color)
 
     # Make a dictionary holding the experiment data
diff --git a/configure_dms_viz/pdb_utils.py b/configure_dms_viz/pdb_utils.py
index f12fd79..a62a099 100644
--- a/configure_dms_viz/pdb_utils.py
+++ b/configure_dms_viz/pdb_utils.py
@@ -197,8 +197,16 @@ def check_wildtype_residues(structure, mut_metric_df, sitemap_df, excluded_chain
         if site_not_in_structure and all(site_not_in_structure):
             missing_sites += 1
 
-    # Calculate the matching and missing sites
-    total_matching_residues = matching_residues / total_sites
+    # How many residues match at sites present in the structure?
+    total_matching_residues = matching_residues / (total_sites - missing_sites)
+    total_matching_string = f"({matching_residues} of {total_sites - missing_sites})"
+    # How many sites in the data are missing in the structure?
     total_missing_sites = missing_sites / total_sites
+    total_missing_string = f"({missing_sites} of {total_sites})"
 
-    return (total_matching_residues, total_missing_sites)
+    return (
+        total_matching_residues,
+        total_missing_sites,
+        total_matching_string,
+        total_missing_string,
+    )