diff --git a/share/man/man9/bus_dma.9 b/share/man/man9/bus_dma.9
index b2ab7698270..82eefc49829 100644
--- a/share/man/man9/bus_dma.9
+++ b/share/man/man9/bus_dma.9
@@ -547,6 +547,13 @@ Are as follows:
 .It Dv BUS_DMA_NOWAIT
 The load should not be deferred in case of insufficient mapping resources,
 and instead should return immediately with an appropriate error.
+.It Dv BUS_DMA_NOCACHE
+The allocated memory will not be cached in the processor caches.
+All memory accesses appear on the bus and are executed
+without reordering.
+Currently, the flag is implemented for i386 and amd64 architectures
+only, where it results in the Strong Uncacheable
+PAT to be set for the allocated virtual address range.
 .El
 .El
 .Pp