diff --git a/resources/shell/bash/ghr-completion.bash b/resources/shell/bash/ghr-completion.bash
index 2fd0ee3..142d7d6 100644
--- a/resources/shell/bash/ghr-completion.bash
+++ b/resources/shell/bash/ghr-completion.bash
@@ -43,11 +43,17 @@ __ghr_complete() {
   cword="${COMP_WORDS[COMP_CWORD]}"
 
   if [ "${COMP_CWORD}" = 1 ]; then
-    COMPREPLY=($(__ghr_complete__static "${cword}" --help cd clone delete help init open browse path profile shell version))
+    COMPREPLY=($(__ghr_complete__static "${cword}" --help add browse cd clone delete help init list open path profile shell sync version))
     return 0
   fi
 
   case "${COMP_WORDS[1]}" in
+  add)
+    COMPREPLY=($(__ghr_complete__static "${cword}" --help))
+    ;;
+  browse)
+    COMPREPLY=($(__ghr_complete__repos "${cword}"))
+    ;;
   cd)
     COMPREPLY=($(__ghr_complete__repos "${cword}"))
     ;;
@@ -60,6 +66,9 @@ __ghr_complete() {
   init)
     COMPREPLY=($(__ghr_complete__static "${cword}" --help))
     ;;
+  list)
+    COMPREPLY=($(__ghr_complete__static "${cword}" --help --no-host --no-owner -p --path))
+    ;;
   open)
     if [ "${COMP_CWORD}" = 2 ]; then
       COMPREPLY=($(__ghr_complete__repos "${cword}" --help))
@@ -68,9 +77,6 @@ __ghr_complete() {
       COMPREPLY=($(compgen -c -- "${cword}"))
     fi
     ;;
-  browse)
-    COMPREPLY=($(__ghr_complete__repos "${cword}"))
-    ;;
   path)
     COMPREPLY=($(__ghr_complete__repos "${cword}"))
     ;;
@@ -90,6 +96,9 @@ __ghr_complete() {
   shell)
     COMPREPLY=($(__ghr_complete__static "${cword}" --help))
     ;;
+  sync)
+    COMPREPLY=($(__ghr_complete__static "${cword}" --help dump restore))
+    ;;
   version)
     COMPREPLY=($(__ghr_complete__static "${cword}" --help))
     ;;
diff --git a/resources/shell/fish/ghr-completion.fish b/resources/shell/fish/ghr-completion.fish
index a5a4eca..12cbe8b 100644
--- a/resources/shell/fish/ghr-completion.fish
+++ b/resources/shell/fish/ghr-completion.fish
@@ -6,20 +6,25 @@ end
 complete -c ghr -f
 
 # Complete commands with their description
+complete -c ghr -n "__fish_is_arg_n 1" -a add -d "Add an existing repository into the ghr managed directory"
+complete -c ghr -n "__fish_is_arg_n 1" -a browse -d "Browse a repository on web"
 complete -c ghr -n "__fish_is_arg_n 1" -a cd -d "Change directory to one of the managed repositories (Shell extension required)"
 complete -c ghr -n "__fish_is_arg_n 1" -a clone -d "Clones a Git repository to local"
 complete -c ghr -n "__fish_is_arg_n 1" -a delete -d "Deletes a repository from local"
 complete -c ghr -n "__fish_is_arg_n 1" -a init -d "Initialises a Git repository in local"
 complete -c ghr -n "__fish_is_arg_n 1" -a list -d "Lists all managed repositories"
 complete -c ghr -n "__fish_is_arg_n 1" -a open -d "Opens a repository in an application"
-complete -c ghr -n "__fish_is_arg_n 1" -a browse -d "Browse a repository on web"
 complete -c ghr -n "__fish_is_arg_n 1" -a path -d "Prints the path to root, owner, or a repository"
 complete -c ghr -n "__fish_is_arg_n 1" -a profile -d "Manages profiles to use in repositories"
 complete -c ghr -n "__fish_is_arg_n 1" -a shell -d "Writes a shell script to extend ghr features"
+complete -c ghr -n "__fish_is_arg_n 1" -a sync -d "Sync repositories between your devices"
 complete -c ghr -n "__fish_is_arg_n 1" -a version -d "Prints the version of this application"
 
+# Complete the 2nd argument of add command using the file path
+complete -c ghr -n "__fish_is_arg_n 2; and __fish_seen_subcommand_from add" -f
+
 # Complete the 2nd argument of cd, delete, path, open, and browse commands using the repository list
-complete -c ghr -n "__fish_is_arg_n 2; and __fish_seen_subcommand_from cd delete path open browse" -a "(ghr list)"
+complete -c ghr -n "__fish_is_arg_n 2; and __fish_seen_subcommand_from browse cd delete path open" -a "(ghr list)"
 
 # Complete the 3rd argument of open command using the known command list
 complete -c ghr -n "__fish_is_arg_n 3; and __fish_seen_subcommand_from open" -a "(complete -C '')"
@@ -31,3 +36,7 @@ complete -c ghr -n "__fish_is_arg_n 2; and __fish_seen_subcommand_from profile"
 
 # Complete the 3rd argument of profile list subcommand using the profile list
 complete -c ghr -n "__fish_is_arg_n 3; and __fish_seen_subcommand_from profile; and __fish_seen_subcommand_from show apply" -a "(ghr profile list --short)"
+
+# Complete subcommands of sync command with their description
+complete -c ghr -n "__fish_is_arg_n 2; and __fish_seen_subcommand_from sync" -a dump -d "Dump remotes and the current ref of all repositories"
+complete -c ghr -n "__fish_is_arg_n 2; and __fish_seen_subcommand_from sync" -a restore -d "Restore repositories from the dumped file"