diff --git a/README.md b/README.md
index 388907b..df06b43 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,8 @@
     - [`toPrint()`](#toprint)
     - [`equals(id)`](#equalsid)
     - [`isEqual(id)`](#isequalid)
+  - [Others](#others)
+    - [`isPeerId(id)`](#ispeeridid)
 - [License](#license)
 
 # Description
@@ -285,6 +287,14 @@ Returns `true` if the given PeerId is equal to the current instance.
 
 - `id` can be a PeerId or a Buffer containing the id
 
+## Others
+
+### `isPeerId(id)`
+
+Returns `true` if the given id is an instance of PeerId
+
+- `id` should be an instance of PeerId
+
 # License
 
 MIT