diff --git a/changelog.md b/changelog.md
index 36c099f12..c2b25bdca 100644
--- a/changelog.md
+++ b/changelog.md
@@ -3,6 +3,7 @@
 ## Unreleased
 <!-- Add all new changes here. They will be moved under a version at release -->
 * `FIX` incorrect argument skip pattern for `--check_out_path=`, which incorrectly skips the next argument
+* `FIX` incorrect error message for `--doc_update`.
 * `FIX` reimplement section `luals.config` in file doc.json
 * `FIX` incorrect file names in file doc.json
 * `FIX` remove extra `./` path prefix in the check report when using `--check=.`
diff --git a/script/cli/doc/init.lua b/script/cli/doc/init.lua
index afb4e4da0..0db36771c 100644
--- a/script/cli/doc/init.lua
+++ b/script/cli/doc/init.lua
@@ -16,7 +16,7 @@ local doc = {}
 local function findDocJson()
     local doc_json_path
     if type(DOC_UPDATE) == 'string' then
-        doc_json_path = fs.absolute(fs.path(DOC_UPDATE)) .. '/doc.json'
+        doc_json_path = fs.canonical(fs.path(DOC_UPDATE)) .. '/doc.json'
     else
         doc_json_path = fs.current_path() .. '/doc.json'
     end
@@ -46,7 +46,7 @@ local function getPathDocUpdate()
         local doc_json_dir = doc_json_path:string():gsub('/doc.json', '')
         return doc_json_dir, doc_path
     else
-        error(string.format('Error: Cannot update "%s".', doc_json_path .. '/doc.json'))
+        error(string.format('Error: Cannot update "%s".', doc_json_path))
     end
 end