diff --git a/include/ircd/m/room/messages.h b/include/ircd/m/room/messages.h
index bbccdeea7..0f0dd3be1 100644
--- a/include/ircd/m/room/messages.h
+++ b/include/ircd/m/room/messages.h
@@ -28,7 +28,9 @@ namespace ircd::m
 	using depth_range_closure = std::function<bool (const depth_range &, const event::idx &)>;
 	bool for_each_depth_gap(const room &, const depth_range_closure &);
 	bool rfor_each_depth_gap(const room &, const depth_range_closure &);
-	std::pair<bool, int64_t> is_complete(const room &);
+
+	std::pair<int64_t, event::idx> first_missing(const room &);
+	std::pair<int64_t, event::idx> sounding(const room &); // Last missing
 }
 
 /// Interface to room messages
diff --git a/ircd/m.cc b/ircd/m.cc
index 7ae85816c..4e8db89a7 100644
--- a/ircd/m.cc
+++ b/ircd/m.cc
@@ -4779,6 +4779,28 @@ ircd::m::commit(const room &room,
 	return eval.event_id;
 }
 
+std::pair<int64_t, ircd::m::event::idx>
+ircd::m::sounding(const room &r)
+{
+	static mods::import<decltype(sounding)> call
+	{
+		"m_room", "ircd::m::sounding"
+	};
+
+	return call(r);
+}
+
+std::pair<int64_t, ircd::m::event::idx>
+ircd::m::first_missing(const room &r)
+{
+	static mods::import<decltype(first_missing)> call
+	{
+		"m_room", "ircd::m::first_missing"
+	};
+
+	return call(r);
+}
+
 bool
 ircd::m::rfor_each_depth_gap(const room &r,
                              const depth_range_closure &c)
@@ -4807,19 +4829,6 @@ ircd::m::for_each_depth_gap(const room &r,
 	return call(r, c);
 }
 
-std::pair<bool, int64_t>
-ircd::m::is_complete(const room &r)
-{
-	using prototype = std::pair<bool, int64_t> (const room &);
-
-	static mods::import<prototype> call
-	{
-		"m_room", "ircd::m::is_complete"
-	};
-
-	return call(r);
-}
-
 size_t
 ircd::m::count_since(const m::event::id &a,
                      const m::event::id &b)
diff --git a/modules/console.cc b/modules/console.cc
index 4bc5c9e8c..c86baafc3 100644
--- a/modules/console.cc
+++ b/modules/console.cc
@@ -7371,7 +7371,7 @@ console_cmd__room__head__reset(opt &out, const string_view &line)
 }
 
 bool
-console_cmd__room__complete(opt &out, const string_view &line)
+console_cmd__room__sounding(opt &out, const string_view &line)
 {
 	const params param{line, " ",
 	{
@@ -7390,12 +7390,12 @@ console_cmd__room__complete(opt &out, const string_view &line)
 
 	const auto res
 	{
-		m::is_complete(room)
+		m::sounding(room)
 	};
 
-	out << (res.first? "YES" : "NO")
-	    << " @ depth " << res.second
-	    << std::endl;
+	out << "depth:  " << res.first << std::endl
+	    << "event:  " << res.second << " " << m::event_id(res.second) << std::endl
+	    ;
 
 	return true;
 }
diff --git a/modules/m_room.cc b/modules/m_room.cc
index 765e59b6b..2de88d0da 100644
--- a/modules/m_room.cc
+++ b/modules/m_room.cc
@@ -477,21 +477,38 @@ ircd::m::room::head::for_each(const head &head,
 	return true;
 }
 
-std::pair<bool, int64_t>
+std::pair<int64_t, ircd::m::event::idx>
 IRCD_MODULE_EXPORT
-ircd::m::is_complete(const room &room)
+ircd::m::sounding(const room &room)
 {
-	std::pair<bool, int64_t> ret {true, -1L};
-	for_each_depth_gap(room, [&ret]
-	(const auto &range)
+	std::pair<int64_t, m::event::idx> ret
 	{
-		ret.second = range.second - 1;
-		ret.first = false;
+		-1, 0
+	};
+
+	rfor_each_depth_gap(room, [&ret]
+	(const auto &range, const auto &event_idx)
+	{
+		ret.first = range.second;
+		ret.second = event_idx;
 		return false;
 	});
 
-	if(ret.second == -1L)
-		ret.first = false;
+	return ret;
+}
+
+std::pair<int64_t, ircd::m::event::idx>
+IRCD_MODULE_EXPORT
+ircd::m::first_missing(const room &room)
+{
+	std::pair<int64_t, m::event::idx> ret {0, 0};
+	for_each_depth_gap(room, [&ret]
+	(const auto &range, const auto &event_idx)
+	{
+		ret.first = range.first;
+		ret.second = event_idx;
+		return false;
+	});
 
 	return ret;
 }