diff --git a/lib/Kconfig b/lib/Kconfig
index 4af07ec..d411de5 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -283,4 +283,14 @@
 	  It is used to implement RSA digital signature verification,
 	  which is used by IMA/EVM digital signature extension.
 
+config MPILIB_EXTRA
+	bool "Multiprecision maths library - additional sources"
+	depends on MPILIB
+	help
+	  Multiprecision maths library from GnuPG.
+	  It is used to implement RSA digital signature verification,
+	  which is used by IMA/EVM digital signature extension.
+	  This code in unnecessary for RSA digital signature verification,
+	  and can be compiled if needed.
+
 endmenu