CLOUDSTACK-1359: describe 1GB as 2^30
diff --git a/source/service_offerings.rst b/source/service_offerings.rst
index c13a426..e43537f 100644
--- a/source/service_offerings.rst
+++ b/source/service_offerings.rst
@@ -322,7 +322,7 @@
in Disk Size.
- **Disk Size**: Appears only if Custom Disk Size is not selected.
- Define the volume size in GB.
+ Define the volume size in GB (2^30 1GB = 1,073,741,824 Bytes).
- **QoS Type**: Three options: Empty (no Quality of Service), hypervisor
(rate limiting enforced on the hypervisor side), and storage
