diff --git a/src/prop.c b/src/prop.c
index dc3e679b..d87d33f7 100644
--- a/src/prop.c
+++ b/src/prop.c
@@ -221,7 +221,8 @@ prop_read_value
  *
  */
 void
-prop_read_values(void *obj, const property_t *pl, htsmsg_t *m, int optmask, htsmsg_t *inc)
+prop_read_values
+  (void *obj, const property_t *pl, htsmsg_t *m, int optmask, htsmsg_t *inc)
 {
   if(pl == NULL)
     return;
@@ -233,7 +234,8 @@ prop_read_values(void *obj, const property_t *pl, htsmsg_t *m, int optmask, htsm
  *
  */
 void
-prop_serialize(void *obj, const property_t *pl, htsmsg_t *msg, int optmask, htsmsg_t *inc)
+prop_serialize
+  (void *obj, const property_t *pl, htsmsg_t *msg, int optmask, htsmsg_t *inc)
 {
   if(pl == NULL)
     return;
@@ -253,13 +255,40 @@ prop_serialize(void *obj, const property_t *pl, htsmsg_t *msg, int optmask, htsm
     if (pl->islist)
       htsmsg_add_u32(m, "list", 1);
 
+    /* Default */
+    // TODO: currently no support for list defaults
+    switch (pl->type) {
+      case PT_BOOL:
+        htsmsg_add_bool(m, "default", pl->def.i);
+        break;
+      case PT_INT:
+        htsmsg_add_u32(m, "default", pl->def.i);
+        break;
+      case PT_U16:
+        htsmsg_add_u32(m, "default", pl->def.u16);
+        break;
+      case PT_U32:
+        htsmsg_add_u32(m, "default", pl->def.u32);
+        break;
+      case PT_DBL:
+        htsmsg_add_dbl(m, "default", pl->def.d);
+        break;
+      case PT_STR:
+        htsmsg_add_str(m, "default", pl->def.s ?: "");
+        break;
+    }
+
     /* Options */
     if (pl->opts & PO_RDONLY)
-      htsmsg_add_u32(m, "rdonly", 1);
+      htsmsg_add_bool(m, "rdonly", 1);
     if (pl->opts & PO_NOSAVE)
-      htsmsg_add_u32(m, "nosave", 1);
+      htsmsg_add_bool(m, "nosave", 1);
     if (pl->opts & PO_WRONCE)
-      htsmsg_add_u32(m, "wronce", 1);
+      htsmsg_add_bool(m, "wronce", 1);
+    if (pl->opts & PO_ADVANCED)
+      htsmsg_add_bool(m, "advanced", 1);
+    if (pl->opts & PO_HIDDEN)
+      htsmsg_add_bool(m, "hidden", 1);
 
     /* Enum list */
     if (pl->list)
diff --git a/src/prop.h b/src/prop.h
index 9567d8aa..f26c4501 100644
--- a/src/prop.h
+++ b/src/prop.h
@@ -39,10 +39,12 @@ typedef enum {
 /*
  * Property options
  */
-#define PO_NONE   0x00
-#define PO_RDONLY 0x01  // Property is read-only 
-#define PO_NOSAVE 0x02  // Property is transient (not saved)
-#define PO_WRONCE 0x04  // Property is write-once (i.e. on creation)
+#define PO_NONE     0x00
+#define PO_RDONLY   0x01  // Property is read-only 
+#define PO_NOSAVE   0x02  // Property is transient (not saved)
+#define PO_WRONCE   0x04  // Property is write-once (i.e. on creation)
+#define PO_ADVANCED 0x08  // Property is advanced
+#define PO_HIDDEN   0x10  // Property is hidden (by default)
 
 /*
  * Property definition
@@ -63,6 +65,15 @@ typedef struct property {
                                    ///< Lists should be CSV. This is used for
                                    ///< sorting and searching in UI API
 
+  /* Default (for UI) */
+  union {
+    int         i;   // PT_BOOL/PT_INT
+    const char *s;   // PR_STR
+    uint16_t    u16; // PT_U16
+    uint32_t    u32; // PR_U32
+    double      d;   // PT_DBL
+  } def;
+
   /* Notification callback */
   void        (*notify)   (void *ptr);