diff --git a/bin/pt-duplicate-key-checker b/bin/pt-duplicate-key-checker
index e7a568ab..e34cd36f 100755
--- a/bin/pt-duplicate-key-checker
+++ b/bin/pt-duplicate-key-checker
@@ -5220,9 +5220,9 @@ It also looks for duplicate foreign keys.  A duplicate foreign key covers the
 same columns as another in the same table, and references the same parent
 table.
 
-The output ends with a short summary that includes the total size in bytes 
-that the duplicate indexes ara using. This is calculated by multiplying the 
-index length in bytes times the number of rows in their respective tables.
+The output ends with a short summary that includes an estimate of the total 
+size, in bytes, that the duplicate indexes are using. This is calculated by 
+multiplying the index length by the number of rows in their respective tables.
 
 =head1 OPTIONS