diff --git a/source/reference/limits.txt b/source/reference/limits.txt
index 2281cfa9e1c..c9622d2e765 100644
--- a/source/reference/limits.txt
+++ b/source/reference/limits.txt
@@ -76,7 +76,7 @@ Indexes
 .. limit:: Index Name Length
 
    The names of indexes, including their namespace (i.e database and
-   collection name) cannot be longer than 128 characters. The default
+   collection name) cannot be longer than 125 characters. The default
    index name is the concatenation of the field names and index
    directions.