update docs

Signed-off-by: scepter914 <scepter914@gmail.com>

Author: scepter914

docs/docs_custom_transfer_agent.md

@@ -11,6 +11,50 @@ Using a Custom Transfer Agent, you can operate these on AWS S3 and are free from
 
 ### Compare fee between GitHub Git LFS and AWS S3
 
+(Information on 2025/12/01)
+
+GitHub includes monthly download bandwidth and storage for Git LFS, depending on your plan:
+
+- Free / Pro / Free for organizations: 10 GiB/month bandwidth + 10 GiB storage
+- Team / Enterprise Cloud: 250 GiB/month bandwidth + 250 GiB storage
+
+Notes:
+
+- Bandwidth resets monthly, but storage does not reset (it accumulates over time).
+- Downloads by GitHub Actions and collaborators also count against the repo owner’s LFS bandwidth.
+
+If you exceed the included quota and have billing enabled:
+
+- Storage: $0.07 per GiB-month
+- Download bandwidth: $0.0875 per GiB
+
+Maximum LFS object size depends on the plan in GitHub-hosted LFS:
+
+- Free / Pro: 2 GB
+- Team: 4 GB
+- Enterprise Cloud: 5 GB
+
+By using custom transfer backend, you can replace to Amazon S3.
+
+- Storage: about $0.023 per GB-month (first 50 TB tier)
+- Data transfer: first 100 GB/month free, then roughly $0.09 per GB
+
+### Example use case
+
+Assumptions:
+- Stored: 200 GiB
+- Downloaded per month: 1 TiB (≈ 1024 GiB)
+
+- 1. GitHub Free + AWS S3
+  - GitHub: $0
+  - S3 storage: ~200 GB × $0.023 ≈ $4.60 / month (region may vary)
+  - S3 egress: (1024 − 100) GB × $0.09 = $83.16 / month
+  - Total ≈ $87.76 / month
+- 2. GitHub Enterprise Cloud + GitHub-hosted LFS
+  - GitHub Enterprise Cloud: $21 × N users / month
+  - Overage bandwidth: (1024 − 250) GiB × $0.0875 = $67.73 / month
+  - Total ≈ ($21 × N) + $67.73 / month
+
 ## Get started
 ### Install