pf8x00 module build was not documented.

Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
---
 drivers/regulator/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index eafa13be6e3e..ba8c09d90701 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -846,6 +846,10 @@ config REGULATOR_PF8X00
 	  Say y here to support the regulators found on the NXP
 	  PF8100/PF8121A/PF8200 PMIC.
 
+	  Say M here if you want to support for the regulators found
+	  on the NXP PF8100/PF8121A/PF8200 PMIC. The module will be named
+	  "pf8x00-regulator".
+
 config REGULATOR_PFUZE100
 	tristate "Freescale PFUZE100/200/3000/3001 regulator driver"
 	depends on I2C && OF
-- 
2.25.1