The command description was missing the optional argument. Add it there
for consistency with the rest of the commands.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
---
 tools/bpf/bpftool/Documentation/bpftool-btf.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/Documentation/bpftool-btf.rst b/tools/bpf/bpftool/Documentation/bpftool-btf.rst
index 3f6bca03ad2e..245569f43035 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-btf.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-btf.rst
@@ -43,7 +43,7 @@ bpftool btf { show | list } [id *BTF_ID*]
     that hold open file descriptors (FDs) against BTF objects. On such kernels
     bpftool will automatically emit this information as well.
 
-bpftool btf dump *BTF_SRC*
+bpftool btf dump *BTF_SRC* [format *FORMAT*]
     Dump BTF entries from a given *BTF_SRC*.
 
     When **id** is specified, BTF object with that ID will be loaded and all
-- 
2.46.0