diff --git a/tools/lint/docs/coding-style/coding_style_cpp.rst b/tools/lint/docs/coding-style/coding_style_cpp.rst
index 6f29ed959ad8..06a4837a38b4 100644
--- a/tools/lint/docs/coding-style/coding_style_cpp.rst
+++ b/tools/lint/docs/coding-style/coding_style_cpp.rst
@@ -242,8 +242,8 @@ is doing, without needing to further examine base classes.
 Operators
 ~~~~~~~~~
 
-Unary keyword operators, such as ``typeof`` and ``sizeof``, should have
-their operand parenthesized; e.g. ``typeof("foo") == "string"``.
+The unary keyword operator ``sizeof``, should have its operand parenthesized
+even if it is an expression; e.g. ``int8_t arr[64]; memset(arr, 42, sizeof(arr));``.
 
 
 Literals
diff --git a/tools/lint/docs/coding-style/coding_style_js.rst b/tools/lint/docs/coding-style/coding_style_js.rst
index 3dd493d09b4c..46ec1dd8a6aa 100644
--- a/tools/lint/docs/coding-style/coding_style_js.rst
+++ b/tools/lint/docs/coding-style/coding_style_js.rst
@@ -66,6 +66,8 @@ line, in long member expression.
 
 In JavaScript, ``==`` is preferred to ``===``.
 
+Unary keyword operators, such as ``typeof``, should have their operand
+parenthesized; e.g. ``typeof("foo") == "string"``.
 
 Literals
 ~~~~~~~~