diff --git a/docs/simplesamlphp-upgrade-notes-1.13.txt b/docs/simplesamlphp-upgrade-notes-1.13.txt
index e76cd1635b150490880cf7865a0b512bebe2c2f2..07ed99b61a7eb702108487d4c851b0fb05b70954 100644
--- a/docs/simplesamlphp-upgrade-notes-1.13.txt
+++ b/docs/simplesamlphp-upgrade-notes-1.13.txt
@@ -4,3 +4,4 @@ Upgrade notes for simpleSAMLphp 1.13
   * The RSA_1.5 (RSA with PKCS#1 v1.5 padding) algorithm is now longer allowed by default. This means messages received
   that use this algorithm will fail to decrypt.
   * Several functions, classes and interfaces are now deprecated. Please check your code if you are using the API.
+  * A workaround related to performance issues when processing large metadata sets was included in **1.13.2**. **This workaround is experimental and could have unexpected side effects**.
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