diff --git a/README.rst b/README.rst
index 8d8a98d..1aa82a1 100644
--- a/README.rst
+++ b/README.rst
@@ -11,6 +11,12 @@ Python Monero module
 .. |coveralls| image:: https://coveralls.io/repos/github/monero-ecosystem/monero-python/badge.svg
 .. _coveralls: https://coveralls.io/github/monero-ecosystem/monero-python
 
+.. warning:: **URGENT SECURITY UPDATE**
+   The version 1.0.2 contains an urgent security update in the output recognition code. If you're
+   using the module for scanning transactions and identifying outputs using the secret view key,
+   UPDATE THE SOFTWARE IMMEDIATELY.
+   Otherwise you're safe. Standard wallet operations like receiving payments, spending, address
+   generation etc. are NOT AFFECTED.
 
 A comprehensive Python module for handling Monero cryptocurrency.
 
diff --git a/docs/source/index.rst b/docs/source/index.rst
index 6c9b1cd..3846232 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -3,6 +3,13 @@
 Python module for Monero
 ========================
 
+.. warning:: **URGENT SECURITY UPDATE**
+   The version 1.0.2 contains an urgent security update in the output recognition code. If you're
+   using the module for scanning transactions and identifying outputs using the secret view key,
+   UPDATE THE SOFTWARE IMMEDIATELY.
+   Otherwise you're safe. Standard wallet operations like receiving payments, spending, address
+   generation etc. are NOT AFFECTED.
+
 Welcome to the documentation for the ``monero`` Python module.
 
 The aim of this project is to offer a set of tools for interacting with Monero