diff --git a/src/TLV8.cpp b/src/TLV8.cpp
index ff766f7..a486136 100644
--- a/src/TLV8.cpp
+++ b/src/TLV8.cpp
@@ -80,6 +80,14 @@ TLV8_it TLV8::add(uint8_t tag, size_t len, const uint8_t* val){
 
 /////////////////////////////////////
 
+TLV8_it TLV8::add(uint8_t tag, TLV8 &subTLV){
+  auto it=add(tag,subTLV.pack_size(),NULL);      // create space for inserting sub TLV and store iterator to new element
+  subTLV.pack(*it);                              // pack subTLV into new element
+  return(--end());
+}
+
+/////////////////////////////////////
+
 TLV8_it TLV8::find(uint8_t tag, TLV8_it it1, TLV8_it it2){
 
   auto it=it1;
diff --git a/src/TLV8.h b/src/TLV8.h
index 1ca1ea3..5985e4d 100644
--- a/src/TLV8.h
+++ b/src/TLV8.h
@@ -80,6 +80,7 @@ class TLV8 : public std::list<tlv8_t, Mallocator<tlv8_t>> {
   TLV8_it add(uint8_t tag, size_t len, const uint8_t *val);
   TLV8_it add(uint8_t tag, uint8_t val){return(add(tag, 1, &val));}
   TLV8_it add(uint8_t tag){return(add(tag, 0, NULL));}
+  TLV8_it add(uint8_t tag, TLV8 &subTLV);
 
   TLV8_it find(uint8_t tag, TLV8_it it1, TLV8_it it2);
   TLV8_it find(uint8_t tag, TLV8_it it1){return(find(tag, it1, end()));}