diff --git a/AutoMark/scripts/mods/AutoMark/AutoMark.lua b/AutoMark/scripts/mods/AutoMark/AutoMark.lua
index b80aaad..797e4e8 100644
--- a/AutoMark/scripts/mods/AutoMark/AutoMark.lua
+++ b/AutoMark/scripts/mods/AutoMark/AutoMark.lua
@@ -545,6 +545,9 @@ local function auto_mark_by_tag(tag_name, t, fixed_frame)
             local smart_tag_system = context.smart_tag_system
             local player_unit = context.player and context.player.player_unit
             if smart_tag_system and player_unit then
+                if mod.log_action then
+                    mod:log_action(string.format("CANCEL %s (dead)", mod:breed_name(marked_target)))
+                end
                 mod:print_debug("Auto Mark target dead, releasing tag")
                 smart_tag_system:cancel_tag(marked_tag._id, player_unit, true)
                 marked_tag = nil
diff --git a/AutoMark/scripts/mods/AutoMark/mark/base_mark.lua b/AutoMark/scripts/mods/AutoMark/mark/base_mark.lua
index 70028c2..eed524b 100644
--- a/AutoMark/scripts/mods/AutoMark/mark/base_mark.lua
+++ b/AutoMark/scripts/mods/AutoMark/mark/base_mark.lua
@@ -45,6 +45,13 @@ function mod:cancel_mark(tag_id)
         return
     end
 
+    if mod.log_action then
+        local tag = smart_tag_system._all_tags and smart_tag_system._all_tags[tag_id]
+        if tag then
+            mod:log_action(string.format("CANCEL %s (mod)", mod:breed_name(tag._target_unit)))
+        end
+    end
+
     local player = context.player
     local player_unit = player and player.player_unit
     if not player_unit then
@@ -89,6 +96,9 @@ function mod:set_auto_mark(tag_name, target_unit, target_tag)
         end
     end
 
+    if mod.log_action then
+        mod:log_action(string.format("PING[%s] %s (%s)", tostring(tag_name), mod:breed_name(target_unit), tag_context.tag and "switch" or "new"))
+    end
     mod:print_debug("Auto Mark", tag_name, target_unit)
     on_set_tag(tag_context)
     local template_name_id = NetworkLookup.smart_tag_templates[tag_name]
diff --git a/AutoMark/scripts/mods/AutoMark/ui/debug_hud.lua b/AutoMark/scripts/mods/AutoMark/ui/debug_hud.lua
index 645cd0f..c3817f0 100644
--- a/AutoMark/scripts/mods/AutoMark/ui/debug_hud.lua
+++ b/AutoMark/scripts/mods/AutoMark/ui/debug_hud.lua
@@ -141,6 +141,16 @@ function mod:build_debug_hud_lines()
         end
     end
 
+    local ring = mod.action_log
+    if ring and #ring > 0 then
+        local now = mod:get_latest_fixed_time()
+        buf[#buf + 1] = "ACTIONS"
+        for i = math.max(1, #ring - 4), #ring do
+            local e = ring[i]
+            buf[#buf + 1] = string.format("  %4.1fs  %s", now - e.t, e.s)
+        end
+    end
+
     local confirm = mod.last_skull_confirm
     if confirm then
         buf[#buf + 1] = "SERVER last " .. tostring(confirm.n) .. ": " .. (confirm.accepted and "ACCEPTED" or "REJECTED")
diff --git a/AutoMark/scripts/mods/AutoMark/utils/utils.lua b/AutoMark/scripts/mods/AutoMark/utils/utils.lua
index 57ba503..c2e4ebd 100644
--- a/AutoMark/scripts/mods/AutoMark/utils/utils.lua
+++ b/AutoMark/scripts/mods/AutoMark/utils/utils.lua
@@ -31,6 +31,30 @@ function mod:get_gameplay_time()
     return Managers.time:time("gameplay")
 end
 
+function mod:breed_name(unit)
+    if not unit then
+        return "?"
+    end
+    local ok, name = pcall(function()
+        local ext = ScriptUnit.extension(unit, "unit_data_system")
+        local breed = ext and ext._breed
+        return breed and breed.name or "?"
+    end)
+    return ok and name or "?"
+end
+
+mod.action_log = {}
+function mod:log_action(text)
+    if not (mod_settings.debug_hud or mod_settings.debug_mode) then
+        return
+    end
+    local ring = mod.action_log
+    ring[#ring + 1] = { t = FixedFrame.get_latest_fixed_time(), s = text }
+    if #ring > 40 then
+        table.remove(ring, 1)
+    end
+end
+
 function mod:get_latest_fixed_time()
     return FixedFrame.get_latest_fixed_time()
 end