diff --git a/net/phonet/Kconfig b/net/phonet/Kconfig
index 901956ada9c8c956c49241a130db68294449f4bc..a4fceb8fbcc266e0dd4c40abac279557b895970b 100644
--- a/net/phonet/Kconfig
+++ b/net/phonet/Kconfig
@@ -24,4 +24,5 @@ config PHONET_PIPECTRLR
 	  data with Nokia Slim modems like WG2.5 used on ST-Ericsson U8500
 	  platform.
 
-	  If unsure, say N.
+	  This option is incompatible with older Nokia modems.
+	  Say N here unless you really know what you are doing.