diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index a81a6704142dcc..f8ff392a7f2ccf 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -2008,7 +2008,16 @@ expression support in the :mod:`re` module).
    otherwise. Decimal characters are those that can be used to form
    numbers in base 10, e.g. U+0660, ARABIC-INDIC DIGIT
    ZERO.  Formally a decimal character is a character in the Unicode
-   General Category "Nd".
+   General Category "Nd". For example:
+
+   .. doctest::
+
+      >>> '0123456789'.isdecimal()
+      True
+      >>> '٠١٢٣٤٥٦٧٨٩'.isdecimal() # ARABIC-INDIC DIGIT ZERO TO NINE
+      True
+      >>> 'alphabetic'.isdecimal()
+      False
 
 
 .. method:: str.isdigit()