diff --git a/changelog.md b/changelog.md
index 5f76cb235..628e35c48 100644
--- a/changelog.md
+++ b/changelog.md
@@ -2,8 +2,9 @@
 
 ## Unreleased
 <!-- Add all new changes here. They will be moved under a version at release -->
-* `CHG` When analyzing the literal table, only the first 100 items are analyzed at most.
-* `CHG` When checking type matching for union types, only the first 100 items are checked at most.
+* `CHG` when analyzing the literal table, only the first 100 items are analyzed at most
+* `CHG` when checking type matching for union types, only the first 100 items are checked at most
+* `FIX` Update `--help` message.
 * `FIX` --check now respects ignoreDir setting
 * `FIX` incorrect argument skip pattern for `--check_out_path=`, which incorrectly skips the next argument
 
diff --git a/script/cli/help.lua b/script/cli/help.lua
index 6aa218afc..6ab813912 100644
--- a/script/cli/help.lua
+++ b/script/cli/help.lua
@@ -55,7 +55,8 @@ local args = {
         type = 'string',
         description = [[
             Generate documentation from a workspace.
-            The files will be output in your log path.
+            The files will be written to the documentation output path passed
+            in --doc_out_path.
         ]],
         example = [[--doc=C:/Users/Me/Documents/myLuaProject/]]
     },
@@ -63,10 +64,18 @@ local args = {
         type = 'string',
         description = [[
             The path to output generated documentation at.
+            If --doc_out_path is missing, the documentation will be written
+            to the current directory.
             See --doc for more info.
         ]],
         example = [[--doc_out_path=C:/Users/Me/Documents/myLuaProjectDocumentation]]
     },
+    ['--doc_update'] = {
+        type = 'string',
+        description = [[
+            Update existing documentation files at the given path.
+        ]]
+    },
     ['--logpath'] = {
         type = 'string',
         description = [[