diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 6f440d82b58db05e63d3a2ff9e32918e74974ebc..b38cc34281b86414c585050cd932f6112394e501 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -7,7 +7,8 @@ config PRINTK_TIME
 	  included in printk output.  This allows you to measure
 	  the interval between kernel operations, including bootup
 	  operations.  This is useful for identifying long delays
-	  in kernel startup.
+	  in kernel startup.  Or add printk.time=1 at boot-time.
+	  See Documentation/kernel-parameters.txt
 
 config ENABLE_WARN_DEPRECATED
 	bool "Enable __deprecated logic"