diff --git a/pbs-api-types/src/human_byte.rs b/pbs-api-types/src/human_byte.rs
index e8ea27d0..142a0d4e 100644
--- a/pbs-api-types/src/human_byte.rs
+++ b/pbs-api-types/src/human_byte.rs
@@ -1,5 +1,7 @@
 use anyhow::{bail, Error};
 
+use proxmox_schema::{ApiStringFormat, ApiType, Schema, StringSchema, UpdaterType};
+
 /// Size units for byte sizes
 #[derive(Debug, Copy, Clone, PartialEq)]
 pub enum SizeUnit {
@@ -118,6 +120,7 @@ fn strip_unit(v: &str) -> (&str, SizeUnit) {
 }
 
 /// Byte size which can be displayed in a human friendly way
+#[derive(Debug, Copy, Clone, UpdaterType)]
 pub struct HumanByte {
     /// The siginficant value, it does not includes any factor of the `unit`
     size: f64,
@@ -125,6 +128,22 @@ pub struct HumanByte {
     unit: SizeUnit,
 }
 
+fn verify_human_byte(s: &str) -> Result<(), Error> {
+    match s.parse::<HumanByte>() {
+        Ok(_) => Ok(()),
+        Err(err) => bail!("byte-size parse error for '{}': {}", s, err),
+    }
+}
+impl ApiType for HumanByte {
+    const API_SCHEMA: Schema = StringSchema::new(
+        "Byte size with optional unit (B, KB (base 10), MB, GB, ..., KiB (base 2), MiB, Gib, ...).",
+    )
+    .format(&ApiStringFormat::VerifyFn(verify_human_byte))
+    .min_length(1)
+    .max_length(64)
+    .schema();
+}
+
 impl HumanByte {
     /// Create instance with size and unit (size must be positive)
     pub fn with_unit(size: f64, unit: SizeUnit) -> Result<Self, Error> {
@@ -197,6 +216,9 @@ impl std::str::FromStr for HumanByte {
     }
 }
 
+proxmox::forward_deserialize_to_from_str!(HumanByte);
+proxmox::forward_serialize_to_display!(HumanByte);
+
 #[test]
 fn test_human_byte_parser() -> Result<(), Error> {
     assert!("-10".parse::<HumanByte>().is_err()); // negative size