diff --git a/CHANGELOG.md b/CHANGELOG.md
index ef959d1..6b48a3b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Changed
+- Document `GET_SIGNED_TOKEN` cached token behavior in README
+
 ## [0.16.0] - 2026-05-22
 
 ## [0.15.1] - 2026-04-28
diff --git a/README.md b/README.md
index 98fd473..6766f47 100644
--- a/README.md
+++ b/README.md
@@ -212,6 +212,10 @@ JWT can be used to ensure that the custom UI extension is loaded by Pipedrive. I
 requests and be verified on the server side. As JWT expires in 5 minutes, you can use this command
 to get a new one.
 
+If the previously issued token for the extension hasn't expired yet, calling this command again
+returns that same cached token instead of generating a new one. This means calling it repeatedly
+in a short time span is safe and won't produce a different token each time.
+
 **Response**
 
 | Parameter | Type   | Description | Notes |