diff --git a/src/types/index.ts b/src/types/index.ts
index ce4e013a..0fe69ac4 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -14,7 +14,13 @@ export interface Dictionary<T> {
 }
 
 export const ADDRESS_HEX_LENGTH = 64
-export const PSS_TARGET_HEX_LENGTH_MAX = 4
+
+/**
+ * Maximum accepted length of target of hex string.
+ *
+ * @see https://github.com/ethersphere/bee/blob/master/pkg/api/pss.go#L29
+ */
+export const PSS_TARGET_HEX_LENGTH_MAX = 6
 export const PUBKEY_HEX_LENGTH = 66
 export const BATCH_ID_HEX_LENGTH = 64
 export const REFERENCE_HEX_LENGTH = 64