diff --git a/api/types/build/disk_usage.go b/api/types/build/disk_usage.go
index e969b6d615..cfd7333272 100644
--- a/api/types/build/disk_usage.go
+++ b/api/types/build/disk_usage.go
@@ -1,6 +1,8 @@
 package build
 
 // CacheDiskUsage contains disk usage for the build cache.
+//
+// Deprecated: this type is no longer used and will be removed in the next release.
 type CacheDiskUsage struct {
 	TotalSize   int64
 	Reclaimable int64
diff --git a/api/types/container/disk_usage.go b/api/types/container/disk_usage.go
index 05b6cbe9c7..d77538c2ab 100644
--- a/api/types/container/disk_usage.go
+++ b/api/types/container/disk_usage.go
@@ -1,6 +1,8 @@
 package container
 
 // DiskUsage contains disk usage for containers.
+//
+// Deprecated: this type is no longer used and will be removed in the next release.
 type DiskUsage struct {
 	TotalSize   int64
 	Reclaimable int64
diff --git a/api/types/image/disk_usage.go b/api/types/image/disk_usage.go
index b29d925cac..e847386a8d 100644
--- a/api/types/image/disk_usage.go
+++ b/api/types/image/disk_usage.go
@@ -1,6 +1,8 @@
 package image
 
 // DiskUsage contains disk usage for images.
+//
+// Deprecated: this type is no longer used and will be removed in the next release.
 type DiskUsage struct {
 	TotalSize   int64
 	Reclaimable int64
diff --git a/api/types/volume/disk_usage.go b/api/types/volume/disk_usage.go
index 3d716c6e00..88974303a0 100644
--- a/api/types/volume/disk_usage.go
+++ b/api/types/volume/disk_usage.go
@@ -1,6 +1,8 @@
 package volume
 
 // DiskUsage contains disk usage for volumes.
+//
+// Deprecated: this type is no longer used and will be removed in the next release.
 type DiskUsage struct {
 	TotalSize   int64
 	Reclaimable int64