diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index dd1a6d4bb7473c4966a720c40e8af0492f9853c5..7936b801fe6acc8e4dfe0f6f288a2e8ce9e81e08 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1115,6 +1115,10 @@ and is between 256 and 4096 characters. It is defined in the file
 			libata.dma=4	  Compact Flash DMA only 
 			Combinations also work, so libata.dma=3 enables DMA
 			for disks and CDROMs, but not CFs.
+	
+	libata.ignore_hpa=	[LIBATA] Ignore HPA limit
+			libata.ignore_hpa=0	  keep BIOS limits (default)
+			libata.ignore_hpa=1	  ignore limits, using full disk
 
 	libata.noacpi	[LIBATA] Disables use of ACPI in libata suspend/resume
 			when set.