diff --git a/configs/saml21-xplained/README.txt b/configs/saml21-xplained/README.txt
index 16daece1b3..16d11c40a9 100644
--- a/configs/saml21-xplained/README.txt
+++ b/configs/saml21-xplained/README.txt
@@ -32,7 +32,8 @@ STATUS/ISSUES
     configuration is working well with the serial console provided by
     SERCOM4 as 115200 8N1.
 
-  - 2015-6-14: Added a DMAC driver.  There is no way to verify it at present.
+  - 2015-6-14: Added a DMAC driver.  There is no way to verify it at present
+    and, hence, depends upon CONFIG_EXPERIMENTAL=y
 
 Modules
 =======