diff --git a/auto-completion/bash/buku-completion.bash b/auto-completion/bash/buku-completion.bash
index 3e6775e..1fa74d4 100644
--- a/auto-completion/bash/buku-completion.bash
+++ b/auto-completion/bash/buku-completion.bash
@@ -11,10 +11,10 @@ _buku () {
     local cur=$2 prev=$3
     local -a opts opts_with_args
     opts=(-a --add -c --comment --deep -d --delete -e --export -h --help
-          -i --import -k --unlock -l --lock --markdown -m --merge --noprompt
-          -o --open -p --print -r --replace -s --sany -S --sall --st --stag
-          --tag -t --title -u --update --upstream --url)
-    opts_with_arg=(-a --add -e --export -i --import -m --merge
+          --immutable -i --import -k --unlock -l --lock --markdown -m --merge
+          --noprompt -o --open -p --print -r --replace -s --sany -S --sall
+          --st --stag --tag -t --title -u --update --upstream --url)
+    opts_with_arg=(-a --add -e --export --immutable -i --import -m --merge
                    -o --open -r --replace -s --sany -S --sall --url)
 
     # Do not complete non option names
diff --git a/auto-completion/fish/buku.fish b/auto-completion/fish/buku.fish
index 4141782..f739738 100644
--- a/auto-completion/fish/buku.fish
+++ b/auto-completion/fish/buku.fish
@@ -10,6 +10,7 @@ complete -c buku -l deep            --description 'search matching substrings'
 complete -c buku -s d -l delete     --description 'delete bookmark'
 complete -c buku -s e -l export  -r --description 'export bookmarks'
 complete -c buku -s h -l help       --description 'show help'
+complete -c buku -l immutable    -r --description 'disable title update from web'
 complete -c buku -s i -l import  -r --description 'import bookmarks'
 complete -c buku -l markdown        --description 'markdown mode'
 complete -c buku -s k -l unlock     --description 'decrypt database'
@@ -22,7 +23,7 @@ complete -c buku -s r -l replace -r --description 'replace a tag'
 complete -c buku -s s -l sany    -r --description 'search any keyword'
 complete -c buku -s S -l sall    -r --description 'search all keywords'
 complete -c buku -l st -l stag      --description 'search by tag or show tags'
-complete -c buku -l tag             --description 'set tags, use + to append'
+complete -c buku -l tag             --description 'set tags, use + to append, - to remove'
 complete -c buku -s t -l title      --description 'set custom title'
 complete -c buku -s u -l update     --description 'update bookmark'
 complete -c buku -l upstream        --description 'check latest upstream release'
diff --git a/auto-completion/zsh/_buku b/auto-completion/zsh/_buku
index 338eb26..acc7e15 100644
--- a/auto-completion/zsh/_buku
+++ b/auto-completion/zsh/_buku
@@ -15,6 +15,7 @@ args=(
     '(-d --delete)'{-d,--delete}'[delete bookmark]'
     '(-e --export)'{-e,--export}'[export bookmarks]:html output file'
     '(-h --help)'{-h,--help}'[show help]'
+    '(--immutable)--immutable[disable title update from web]:value'
     '(-i --import)'{-i,--import}'[import bookmarks]:html imput file'
     '(-k --unlock)'{-k,--unlock}'[decrypt database]'
     '(-l --lock)'{-l,--lock}'[encrypt database]'
@@ -27,7 +28,7 @@ args=(
     '(-s --sany)'{-s,--sany}'[search any keyword]:keyword(s)'
     '(-s --sall)'{-s,--sall}'[search all keywords]:keyword(s)'
     '(-st --stag)'{--st,--stag}'[search by tag or show tags]'
-    '(--tag)--tag[set tags, use + to append]'
+    '(--tag)--tag[set tags, use + to append, - to remove]'
     '(-t --title)'{-t,--title}'[set custom title]'
     '(-u --update)'{-u,--update}'[update bookmark]'
     '(--upstream)--upstream[check latest upstream release]'