diff --git a/autoload/SpaceVim/logger.vim b/autoload/SpaceVim/logger.vim
index 20ef15c0d..cef1ba21a 100644
--- a/autoload/SpaceVim/logger.vim
+++ b/autoload/SpaceVim/logger.vim
@@ -14,7 +14,8 @@ if has('nvim-0.5.0')
           \ require("spacevim").eval("a:msg")
           \ )
   endfunction
-
+  ""
+  " write warning message to spacevim runtime log.
   function! SpaceVim#logger#warn(msg, ...) abort
     let issilent = get(a:000, 0, 1)
     lua require("spacevim.logger").warn(
@@ -23,24 +24,30 @@ if has('nvim-0.5.0')
           \ )
   endfunction
 
-
+  ""
+  " write error message to spacevim runtime log.
   function! SpaceVim#logger#error(msg) abort
     lua require("spacevim.logger").error(
           \ require("spacevim").eval("a:msg")
           \ )
   endfunction
 
+  ""
+  " write debug message to spacevim runtime log.
   function! SpaceVim#logger#debug(msg) abort
     lua require("spacevim.logger").debug(
           \ require("spacevim").eval("a:msg")
           \ )
   endfunction
-
+  ""
+  " This a a function to view the spacevim runtime log. same as
+  " |:SPRuntimeLog| and `SPC h L`
   function! SpaceVim#logger#viewRuntimeLog() abort
     lua require("spacevim.logger").viewRuntimeLog()
   endfunction
 
-
+  ""
+  " Print the debug information of spacevim, same as |:SPDebugInfo|
   function! SpaceVim#logger#viewLog(...) abort
     if a:0 >= 1
       let bang = get(a:000, 0, 0)
@@ -49,11 +56,14 @@ if has('nvim-0.5.0')
       return luaeval('require("spacevim.logger").viewLog()')
     endif
   endfunction
-
+  ""
+  " change the logger level of spacevim runtime log.
   function! SpaceVim#logger#setLevel(level) abort
     lua require("spacevim.logger").setLevel(require("spacevim").eval("a:level"))
   endfunction
-
+  ""
+  " change the output file of spacevim runtime logger. default is empty
+  " string.
   function! SpaceVim#logger#setOutput(file) abort
     lua require("spacevim.logger").setOutput(require("spacevim").eval("a:file"))
   endfunction
@@ -66,6 +76,7 @@ if has('nvim-0.5.0')
   " 4. debug(msg): write debug message run SpaceVim runtime log
   " 5. start_debug(): enable debug mode of derived logger.
   " 6. stop_debug(): stop debug mode of derived logger.
+  " 7. debug_enabled(): return true or false.
   "
   " Example: >
   "   let s:LOGGER = SpaceVim#logger#derive('myplug')
diff --git a/doc/SpaceVim.txt b/doc/SpaceVim.txt
index 777ec3eda..0c9da79c4 100644
--- a/doc/SpaceVim.txt
+++ b/doc/SpaceVim.txt
@@ -1648,6 +1648,28 @@ SpaceVim#layers#load({layer})                         *SpaceVim#layers#load()*
 SpaceVim#logger#info({msg})                           *SpaceVim#logger#info()*
   write message to SpaceVim runtime log with `info` level.
 
+SpaceVim#logger#warn({msg})                           *SpaceVim#logger#warn()*
+  write warning message to spacevim runtime log.
+
+SpaceVim#logger#error({msg})                         *SpaceVim#logger#error()*
+  write error message to spacevim runtime log.
+
+SpaceVim#logger#debug({msg})                         *SpaceVim#logger#debug()*
+  write debug message to spacevim runtime log.
+
+SpaceVim#logger#viewRuntimeLog()            *SpaceVim#logger#viewRuntimeLog()*
+  This a a function to view the spacevim runtime log. same as |:SPRuntimeLog|
+  and `SPC h L`
+
+SpaceVim#logger#viewLog()                          *SpaceVim#logger#viewLog()*
+  Print the debug information of spacevim, same as |:SPDebugInfo|
+
+SpaceVim#logger#setLevel({level})                 *SpaceVim#logger#setLevel()*
+  change the logger level of spacevim runtime log.
+
+SpaceVim#logger#setOutput({file})                *SpaceVim#logger#setOutput()*
+  change the output file of spacevim runtime logger. default is empty string.
+
 SpaceVim#logger#derive({name})                      *SpaceVim#logger#derive()*
   Derive a new logger based on SpaceVim's runtime logger. The new logger
   provides following functions:
@@ -1657,6 +1679,7 @@ SpaceVim#logger#derive({name})                      *SpaceVim#logger#derive()*
     4. debug(msg): write debug message run SpaceVim runtime log
     5. start_debug(): enable debug mode of derived logger.
     6. stop_debug(): stop debug mode of derived logger.
+    7. debug_enabled(): return true or false.
 
   Example:
 >