diff --git a/docs/security.md b/docs/security.md
index fe0981043..96268be8f 100644
--- a/docs/security.md
+++ b/docs/security.md
@@ -5,7 +5,7 @@ Security Policy
 
 | Version | Supported        | Notes          |
 | ------- | ---------------- | -------------- |
-| 4.x     | ✅              |                |
+| 4.x     | ✅               |  Android 5.0+ (API level 21+) and on Java 8+. |
 | 3.14.x  | Until 2020-06-30 |                |
 | 3.12.x  | Until 2021-12-31 | Android 2.3+ (API level 9+) and Java 7+. Platforms may not support TLSv1.2. |