diff --git a/README.md b/README.md
index 4fd9483..3afb32e 100644
--- a/README.md
+++ b/README.md
@@ -245,12 +245,19 @@ Type
from types import FunctionType, MethodType, LambdaType, GeneratorType
```
-### ABC-s
-**Abstract base classes introduce virtual subclasses, that don’t inherit from a class but are still recognized by isinstance() and issubclass().**
+### ABC
+**An abstract base class introduces virtual subclasses, that don’t inherit from it but are still recognized by isinstance() and issubclass().**
```python
from numbers import Integral, Rational, Real, Complex, Number
-from collections.abc import Iterable, Collection, Sequence
+from collections.abc import Sequence, Collection, Iterable
+```
+
+```python
+>>> isinstance(123, Number)
+True
+>>> isinstance([1, 2, 3], Iterable)
+True
```
diff --git a/index.html b/index.html
index 3de0206..be132fc 100644
--- a/index.html
+++ b/index.html
@@ -316,10 +316,15 @@ Point(x=1, y=2
Some types do not have builtin names, so they must be imported:
from types import FunctionType, MethodType, LambdaType, GeneratorType
-ABC-s
-Abstract base classes introduce virtual subclasses, that don’t inherit from a class but are still recognized by isinstance() and issubclass().
+ABC
+An abstract base class introduces virtual subclasses, that don’t inherit from it but are still recognized by isinstance() and issubclass().
from numbers import Integral, Rational, Real, Complex, Number
-from collections.abc import Iterable, Collection, Sequence
+from collections.abc import Sequence, Collection, Iterable
+
+>>> isinstance(123, Number)
+True
+>>> isinstance([1, 2, 3], Iterable)
+True
#String
<str> = <str>.strip()