diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt
index 8621a06..3dc1f91 100644
--- a/Documentation/DMA-API.txt
+++ b/Documentation/DMA-API.txt
@@ -431,10 +431,10 @@
 dma_alloc_noncoherent()).
 
 int
-dma_is_consistent(dma_addr_t dma_handle)
+dma_is_consistent(struct device *dev, dma_addr_t dma_handle)
 
-returns true if the memory pointed to by the dma_handle is actually
-consistent.
+returns true if the device dev is performing consistent DMA on the memory
+area pointed to by the dma_handle.
 
 int
 dma_get_cache_alignment(void)