diff --git a/07.md b/07.md
new file mode 100644
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+++ b/07.md
@@ -0,0 +1,20 @@
+NIP-07
+======
+
+`window.nostr` capability for web browsers
+------------------------------------------
+
+`draft` `optional` `author:fiatjaf`
+
+The `window.nostr` object may be made available by web browsers or extensions and websites or web-apps may make use of it after checking its availability.
+
+That object must define the following methods:
+
+```
+async window.nostr.getPublicKey(): string // returns a public key as hex
+async window.nostr.signEvent(event: Event): Event // takes an event object and returns it with the `sig`
+```
+
+### Implementation example
+
+- [nos2x](https://github.com/fiatjaf/nos2x) is available as a Chromium (and partially Firefox) extension that provides such capabilities.
diff --git a/README.md b/README.md
index 7ac60b7c..d8c00fbb 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ NIPs stand for **Nostr Implementation Possibilities**. They exist to document wh
 - [NIP-04: Encrypted Direct Message](04.md)
 - [NIP-05: Mapping Nostr keys to DNS-based internet identifiers](05.md)
 - [NIP-06: Basic key derivation from mnemonic seed phrase](06.md)
+- [NIP-07: `window.nostr` capability for web browsers](07.md)
 - [NIP-08: Handling Mentions](08.md)
 - [NIP-09: Event Deletion](09.md)
 - [NIP-10: Conventions for clients' use of `e` and `p` tags in text events.](10.md)