diff --git a/share/man/man9/bus_dma.9 b/share/man/man9/bus_dma.9
index 95e380846a71..63b2f1db7700 100644
--- a/share/man/man9/bus_dma.9
+++ b/share/man/man9/bus_dma.9
@@ -446,6 +446,15 @@ allocated with
 Also, due to resource sharing with other tags, this flag does not guarantee
 that resources will be allocated or reserved exclusively for this tag.
 It should be treated only as a minor optimization.
+.It Dv BUS_DMA_COHERENT
+Indicate that the DMA engine and CPU are cache-coherent.
+Cached memory may be used to back allocations created by
+.Fn bus_dmamem_alloc .
+For
+.Fn bus_dma_tag_create ,
+the
+.Dv BUS_DMA_COHERENT
+flag is currently implemented on arm64.
 .El
 .It Fa lockfunc
 Optional lock manipulation function (may be
@@ -504,7 +513,7 @@ For
 .Fn bus_dmamap_create ,
 the
 .Dv BUS_DMA_COHERENT
-flag is currently implemented on arm64 and sparc64.
+flag is currently implemented on sparc64.
 .El
 .It Fa mapp
 Pointer to a