diff --git a/README.md b/README.md
index 2a39c3f..6136e72 100644
--- a/README.md
+++ b/README.md
@@ -251,6 +251,11 @@ source.new = function()
   return self
 end
 
+---Return the source name for some information.
+source.get_debug_name = function()
+  return 'example'
+end
+
 ---Return the source is available or not.
 ---@return boolean
 function source:is_available()
diff --git a/lua/cmp/config/default.lua b/lua/cmp/config/default.lua
index 8428752..ea82f94 100644
--- a/lua/cmp/config/default.lua
+++ b/lua/cmp/config/default.lua
@@ -1,5 +1,3 @@
-local str = require('cmp.utils.str')
-local misc = require('cmp.utils.misc')
 local compare = require('cmp.config.compare')
 local types = require('cmp.types')
 
diff --git a/lua/cmp/source.lua b/lua/cmp/source.lua
index 82c79cd..59e32e1 100644
--- a/lua/cmp/source.lua
+++ b/lua/cmp/source.lua
@@ -48,7 +48,7 @@ end
 ---Reset current completion state
 ---@return boolean
 source.reset = function(self)
-  debug.log(self.id, self.name, 'source.reset')
+  debug.log(self:get_debug_name(), 'source.reset')
   self.cache:clear()
   self.revision = self.revision + 1
   self.context = context.empty()
@@ -102,7 +102,7 @@ source.get_entries = function(self, ctx)
   end)()
 
   return self.cache:ensure({ 'get_entries', self.revision, ctx.cursor_before_line }, function()
-    debug.log('filter', self.name, self.id, #(prev_entries or self.entries))
+    debug.log('filter', self:get_debug_name(), #(prev_entries or self.entries))
 
     local inputs = {}
     local entries = {}
@@ -165,6 +165,14 @@ source.get_default_replace_range = function(self)
   end)
 end
 
+---Return source name.
+source.get_debug_name = function(self)
+  if self.source.get_debug_name then
+    return self.source:get_debug_name()
+  end
+  return self.name .. '(' .. self.id .. ')'
+end
+
 ---Return the source is available or not.
 source.is_available = function(self)
   if self.source.is_available then
@@ -250,7 +258,7 @@ source.complete = function(self, ctx, callback)
     if ctx:get_reason() == types.cmp.ContextReason.TriggerOnly then
       self:reset()
     end
-    debug.log('skip completion', self.name, self.id)
+    debug.log('skip completion', self:get_debug_name())
     return
   end
 
@@ -258,7 +266,7 @@ source.complete = function(self, ctx, callback)
     self.is_triggered_by_symbol = char.is_symbol(string.byte(completion_context.triggerCharacter))
   end
 
-  debug.log('request', self.name, self.id, offset, vim.inspect(completion_context))
+  debug.log('request', self:get_debug_name(), offset, vim.inspect(completion_context))
   local prev_status = self.status
   self.status = source.SourceStatus.FETCHING
   self.request_offset = offset
@@ -274,7 +282,7 @@ source.complete = function(self, ctx, callback)
     self.complete_dedup(function(response)
       self.revision = self.revision + 1
       if (misc.safe(response) and misc.safe(response.items) or misc.safe(response)) ~= nil then
-        debug.log('retrieve', self.name, self.id, #(response.items or response))
+        debug.log('retrieve', self:get_debug_name(), #(response.items or response))
         self.status = source.SourceStatus.COMPLETED
         self.incomplete = response.isIncomplete or false
         self.entries = {}
@@ -284,7 +292,7 @@ source.complete = function(self, ctx, callback)
           self.offset = math.min(self.offset, e:get_offset())
         end
       else
-        debug.log('continue', self.name, self.id, 'nil')
+        debug.log('continue', self:get_debug_name(), 'nil')
         self.status = prev_status
       end
       callback()