diff --git a/docs/usage/openaev-agent.md b/docs/usage/openaev-agent.md
index c1b3eb7a..7303a4a8 100644
--- a/docs/usage/openaev-agent.md
+++ b/docs/usage/openaev-agent.md
@@ -115,6 +115,15 @@ If any of these requirements are not met, installation **will fail or behave unp
 
 * Antivirus exclusions are mandatory and must apply **only** to the `runtimes` directory
 
+
+!!! note
+
+    Microsoft Defender (Windows)
+    Since late January 2026, Microsoft Defender may detect the OpenAEV Agent binary itself using static signatures.
+    In this case, excluding only the `runtimes` folder may not be sufficient.
+    If issues occur (agent blocked, quarantined, or alerts), additional Defender exclusions such as the full agent folder
+    or the agent process may be required.
+
 #### Installation Mode
 
 *[UserSanitized] in the table below means username without special character like "\", "/",...*