diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -0,0 +1,43 @@
+# subprocess_util
+
+## Example output
+
+`btrfs receive` side, actively pulling a snapshot.
+
+```
+[STDOUT] OK
+Reading chunk /mnt/backup/snap/cloud.privacy1st.de/20221015T1432_u.CHUNK.12212
+[STDOUT] OK
+Elapsed time: 14 days, 5:38:16.172379
+Transferred: 2.981 TB
+Speed: 2.542 MB/s
+Reading chunk /mnt/backup/snap/cloud.privacy1st.de/20221015T1432_u.CHUNK.12213
+[STDOUT] OK
+Elapsed time: 14 days, 5:39:54.104637
+Transferred: 2.982 TB
+Speed: 2.542 MB/s
+Reading chunk /mnt/backup/snap/cloud.privacy1st.de/20221015T1432_u.CHUNK.12214
+[STDOUT] EOF
+Elapsed time: 14 days, 5:42:02.535829
+Transferred: 2.982 TB
+Speed: 2.542 MB/s
+Reading chunk /mnt/backup/snap/cloud.privacy1st.de/20221015T1432_u.CHUNK.12215
+Elapsed time: 14 days, 5:42:24.937967
+Transferred: 2.982 TB
+Speed: 2.542 MB/s
+```
+
+`btrfs send` side, passive.
+
+```
+Received "b'OK\n'".
+Handling chunk /mnt/data/btrfs-transfer-chunks/20221015T1432_u.CHUNK.12212
+Saving chunk /mnt/data/btrfs-transfer-chunks/20221015T1432_u.CHUNK.12215
+Received "b'OK\n'".
+Handling chunk /mnt/data/btrfs-transfer-chunks/20221015T1432_u.CHUNK.12213
+Received "b'OK\n'".
+Handling chunk /mnt/data/btrfs-transfer-chunks/20221015T1432_u.CHUNK.12214
+Received "b'OK\n'".
+Handling chunk /mnt/data/btrfs-transfer-chunks/20221015T1432_u.CHUNK.12215
+Received "b'OK\n'".
+```