diff --git a/docs/reference/query-dsl/function-score-query.asciidoc b/docs/reference/query-dsl/function-score-query.asciidoc
index 4b4a82594a1..7c5ca95623e 100644
--- a/docs/reference/query-dsl/function-score-query.asciidoc
+++ b/docs/reference/query-dsl/function-score-query.asciidoc
@@ -208,10 +208,10 @@ not. The number value is of type float.
 [[function-random]]
 ==== Random
 
-The `random_score` generates scores that are uniformly distributed in [0, 1[.
-By default, it uses the internal Lucene doc ids as a source of randomness,
-which is very efficient but unfortunately not reproducible since documents might
-be renumbered by merges.
+The `random_score` generates scores that are uniformly distributed from 0 up to
+but not including 1. By default, it uses the internal Lucene doc ids as a
+source of randomness, which is very efficient but unfortunately not
+reproducible since documents might be renumbered by merges.
 
 In case you want scores to be reproducible, it is possible to provide a `seed`
 and `field`. The final score will then be computed based on this seed, the