diff --git a/README.md b/README.md
index f77ad884..8b07de3b 100644
--- a/README.md
+++ b/README.md
@@ -310,6 +310,12 @@ String json = jwk.toJSON();
 }
 ```
 
+## Limitations
+
+This library should work with any version of Java equal to or newer than Java 8.
+
+It has a dependency on the Base64 class, which was added in [Android API 26](https://developer.android.com/reference/java/util/Base64).
+
 ## Building
  
 ## Building with Maven