diff --git a/doc/sphinx/book/box/box_space.rst b/doc/sphinx/book/box/box_space.rst
index 88291358773721942726f4b0c9a40146160aa1c0..b972afa96af57534b49cf0df4eab644cce5637d0 100644
--- a/doc/sphinx/book/box/box_space.rst
+++ b/doc/sphinx/book/box/box_space.rst
@@ -555,7 +555,7 @@ A list of all ``box.space`` functions follows, then comes a list of all
 
         Parameters: :samp:`{space_object}` = an :ref:`object reference <object-reference>`;
         :samp:`{tuple_value}` (type = Lua table or scalar) =
-        field values, must be passed as a Lua table if tuple_value contains more than one field;
+        field values, must be passed as a Lua table;
         :codeitalic:`{operator, field_no, value}` (type = Lua table) = a group of arguments for each
         operation, indicating what the operation is, what field the
         operation will apply to, and what value will be applied. The
diff --git a/doc/sphinx/book/box/index.rst b/doc/sphinx/book/box/index.rst
index d88a3cf87ae4a2be3cb99250e2beffe41f9123a3..2c2419c1f6eb803c76528f8efa10c6e19d209be0 100644
--- a/doc/sphinx/book/box/index.rst
+++ b/doc/sphinx/book/box/index.rst
@@ -232,7 +232,7 @@ Six examples of basic operations:
     tarantool> box.space.tester:update({999}, {{'=', 2, 'Tarantino'}})
 
     -- Upsert the tuple, changing field field[2] again.
-    -- The syntax of upsert is the same as the syntax of update,
+    -- The syntax of upsert is similar to the syntax of update,
     -- but the return value will be different.
     tarantool> box.space.tester:upsert({999}, {{'=', 2, 'Tarantism'}})