diff --git a/net/bpfilter/Kconfig b/net/bpfilter/Kconfig
index 045144d4a42ceab1cac712c803f4a6e64e7b7859..84015ef3ee27eca86f1a632595f5f91ea8b4378c 100644
--- a/net/bpfilter/Kconfig
+++ b/net/bpfilter/Kconfig
@@ -13,4 +13,8 @@ config BPFILTER_UMH
 	default m
 	help
 	  This builds bpfilter kernel module with embedded user mode helper
+
+	  Note: your toolchain must support building static binaries, since
+	  rootfs isn't mounted at the time when __init functions are called
+	  and do_execv won't be able to find the elf interpreter.
 endif