diff --git a/tools/tlc/tlc/cli.py b/tools/tlc/tlc/cli.py
index 1d4949d..3d60938 100644
--- a/tools/tlc/tlc/cli.py
+++ b/tools/tlc/tlc/cli.py
@@ -12,6 +12,7 @@
 from pathlib import Path
 
 import click
+import jinja2
 import yaml
 
 from tlc.tl import *
@@ -166,6 +167,34 @@
 
 @cli.command()
 @click.argument("filename", type=click.Path(exists=True, dir_okay=False))
+@click.option(
+    "--output",
+    "-O",
+    type=click.Path(exists=False),
+    help="Output filename for the header",
+    default=Path("header.h"),
+)
+def gen_header(filename, output):
+    """Generate a header with common definitions."""
+    tl = TransferList.fromfile(filename)
+    tmp_keys = tl.__dict__
+    tmp_keys["header_guard"] = Path(output).name.replace(".", "_").upper()
+
+    dtb_te = tl.get_entry(1)
+
+    if dtb_te:
+        tmp_keys["dtb_offset"] = dtb_te.offset + dtb_te.hdr_size
+
+    env = jinja2.Environment(
+        loader=jinja2.PackageLoader("tlc", "templates"),
+    )
+    template = env.get_template("header.h.j2")
+    with open(output, "w") as f:
+        f.write(template.render(tmp_keys))
+
+
+@cli.command()
+@click.argument("filename", type=click.Path(exists=True, dir_okay=False))
 def validate(filename):
     """Validate the contents of an existing Transfer List."""
     TransferList.fromfile(filename)