diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index b68c29860cf..9cbbc10f8c9 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -1359,12 +1359,12 @@ Comparisons yield boolean values: ``True`` or ``False``.
 .. index:: pair: chaining; comparisons
 
 Comparisons can be chained arbitrarily, e.g., ``x < y <= z`` is equivalent to
-``x < y and y <= z``, except that ``y`` is evaluated only once (but in both
+``( x < y and y <= z )``, except that ``y`` is evaluated only once (but in both
 cases ``z`` is not evaluated at all when ``x < y`` is found to be false).
 
 Formally, if *a*, *b*, *c*, ..., *y*, *z* are expressions and *op1*, *op2*, ...,
 *opN* are comparison operators, then ``a op1 b op2 c ... y opN z`` is equivalent
-to ``a op1 b and b op2 c and ... y opN z``, except that each expression is
+to a single expression ``( a op1 b and b op2 c and ... y opN z )``, except that each expression is
 evaluated at most once.
 
 Note that ``a op1 b op2 c`` doesn't imply any kind of comparison between *a* and