diff --git a/api-ref/source/v2/parameters.yaml b/api-ref/source/v2/parameters.yaml
index 0d6f269e5f0..eacfcd34c07 100644
--- a/api-ref/source/v2/parameters.yaml
+++ b/api-ref/source/v2/parameters.yaml
@@ -1487,8 +1487,8 @@ source_replica:
   type: string
 source_volid:
   description: |
-    The UUID of the source volume. The API creates a
-    new volume with the same size as the source volume.
+    The UUID of the source volume. The API creates a new volume with the same
+    size as the source volume unless a larger size is requested.
   in: body
   required: false
   type: string
diff --git a/api-ref/source/v3/parameters.yaml b/api-ref/source/v3/parameters.yaml
index 34aad21f3e1..da889e1c7aa 100644
--- a/api-ref/source/v3/parameters.yaml
+++ b/api-ref/source/v3/parameters.yaml
@@ -2400,7 +2400,7 @@ snapshot_id_3:
   description: |
     The UUID of the source volume snapshot. The API
     creates a new volume snapshot with the same size as the source
-    volume snapshot.
+    volume snapshot unless a larger size is requested.
   in: body
   required: true
   type: string
@@ -2473,8 +2473,8 @@ source_replica:
   type: string
 source_volid:
   description: |
-    The UUID of the source volume. The API creates a
-    new volume with the same size as the source volume.
+    The UUID of the source volume. The API creates a new volume with the same
+    size as the source volume unless a larger size is requested.
   in: body
   required: false
   type: string