diff --git a/source/reference/aggregation/sum.txt b/source/reference/aggregation/sum.txt
index f2e77b397ee..c8078f04483 100644
--- a/source/reference/aggregation/sum.txt
+++ b/source/reference/aggregation/sum.txt
@@ -12,5 +12,5 @@ $sum (aggregation)
    Alternately, if you specify a value as an argument,
    :group:`$sum` will increment this field by the specified value
    for every document in the grouping. Typically, as in the first
-   use above, specify a value of ``1`` " in order to count members of the
+   use above, specify a value of ``1`` in order to count members of the
    group.