diff --git a/docs/en/query_language/functions/string_functions.md b/docs/en/query_language/functions/string_functions.md
index 5b1fcc0cc80..448a73789aa 100644
--- a/docs/en/query_language/functions/string_functions.md
+++ b/docs/en/query_language/functions/string_functions.md
@@ -58,7 +58,7 @@ If the string contains a set of bytes that is not UTF-8, then the behavior is un
 
 ## isValidUTF8
 
-Returns 1, if set of bytes is valid UTF-8 encoded, otherwise 0.
+Returns 1, if the set of bytes is valid UTF-8 encoded, otherwise 0.
 
 ## reverse