1 files changed, 18 insertions, 6 deletions

diff --git a/tools/bpf/bpftool/Documentation/common_options.rst b/tools/bpf/bpftool/Documentation/common_options.rst
index 05d06c74dcaa..4107a586b68b 100644
--- a/tools/bpf/bpftool/Documentation/common_options.rst
+++ b/tools/bpf/bpftool/Documentation/common_options.rst
@@ -1,13 +1,16 @@
+.. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
 -h, --help
 	  Print short help message (similar to **bpftool help**).
 
 -V, --version
-	  Print version number (similar to **bpftool version**), and optional
-	  features that were included when bpftool was compiled. Optional
-	  features include linking against libbfd to provide the disassembler
-	  for JIT-ted programs (**bpftool prog dump jited**) and usage of BPF
-	  skeletons (some features like **bpftool prog profile** or showing
-	  pids associated to BPF objects may rely on it).
+	  Print bpftool's version number (similar to **bpftool version**), the
+	  number of the libbpf version in use, and optional features that were
+	  included when bpftool was compiled. Optional features include linking
+	  against libbfd to provide the disassembler for JIT-ted programs
+	  (**bpftool prog dump jited**) and usage of BPF skeletons (some
+	  features like **bpftool prog profile** or showing pids associated to
+	  BPF objects may rely on it).
 
 -j, --json
 	  Generate JSON output. For commands that cannot produce JSON, this
@@ -20,3 +23,12 @@
 	  Print all logs available, even debug-level information. This includes
 	  logs from libbpf as well as from the verifier, when attempting to
 	  load programs.
+
+-l, --legacy
+	  Use legacy libbpf mode which has more relaxed BPF program
+	  requirements. By default, bpftool has more strict requirements
+	  about section names, changes pinning logic and doesn't support
+	  some of the older non-BTF map declarations.
+
+	  See https://github.com/libbpf/libbpf/wiki/Libbpf:-the-road-to-v1.0
+	  for details.