diff --git a/mmv1/products/filestore/Instance.yaml b/mmv1/products/filestore/Instance.yaml
index 2a3902406196..e39ff2693c44 100644
--- a/mmv1/products/filestore/Instance.yaml
+++ b/mmv1/products/filestore/Instance.yaml
@@ -177,8 +177,13 @@ properties:
         - name: capacityGb
           type: Integer
           description: |
-            File share capacity in GiB. This must be at least 1024 GiB
-            for the standard tier, or 2560 GiB for the premium tier.
+            File share capacity in GiB. Acceptable instance capacities for each tier are as follows:
+            * BASIC_HDD: 1024-65433 GiB in 1 GiB increments or its multiples.
+            * BASIC_SSD: 2560-65433 GiB in 1 GiB increments or its multiples.
+            * HIGH_SCALE_SSD: 10240-102400 GiB in 2560 GiB increments or its multiples.
+            * ZONAL: 100-102400 GiB (100-10239 GiB in 1 GiB increments or its multiples; 10240-102400 GiB in 2560 GiB increments or its multiples).
+            * ENTERPRISE: 1024-10240 GiB in 256 GiB increments or its multiples.
+            * REGIONAL: 1024-102400 GiB (100-102400 GiB in supported regions): ((100 or 1024)-10239 GiB in 1 GiB increments or its multiples; 10240-102400 GiB in 2560 GiB increments or its multiples).
           required: true
         - name: sourceBackup
           type: String