diff --git a/build_database.py b/build_database.py
index 6f521dc..4d577e8 100644
--- a/build_database.py
+++ b/build_database.py
@@ -36,9 +36,22 @@ async def main():
                 async with ctx.session.get(url) as resp:
                     assert resp.status == 200
 
+                    total_length = int(resp.headers["content-length"])
+                    downloaded_bytes = 0
+                    download_ratio = 0
+
+                    log.info("to download %d bytes", total_length)
+
                     with tempfile.TemporaryFile() as temp_fd:
                         async for chunk in resp.content.iter_chunked(8192):
                             temp_fd.write(chunk)
+                            downloaded_bytes += len(chunk)
+                            new_download_ratio = round(
+                                (downloaded_bytes / total_length) * 100
+                            )
+                            if new_download_ratio != download_ratio:
+                                log.info("download at %d%%", download_ratio)
+                                download_ratio = new_download_ratio
 
                         # write to output
                         log.info("copying temp to output")