diff --git a/home-manager/completion.bash b/home-manager/completion.bash
index 7828224f..ec20bbc1 100644
--- a/home-manager/completion.bash
+++ b/home-manager/completion.bash
@@ -293,7 +293,9 @@ _home-manager_completions ()
     Options=( "-f" "--file" "-b" "-A" "-I" "-h" "--help" "-n" "--dry-run" "-v" \
               "--verbose" "--cores" "--debug" "--impure" "--keep-failed" \
               "--keep-going" "-j" "--max-jobs" "--no-substitute" "--no-out-link" \
-              "--show-trace" "--substitute" "--builders" "--version")
+              "--show-trace" "--substitute" "--builders" "--version" \
+              "--update-input" "--override-input" "--experimental-features" \
+              "--extra-experimental-features" )
 
     # ^ « home-manager »'s options.
 
diff --git a/home-manager/completion.fish b/home-manager/completion.fish
index cfffe821..aca4943f 100644
--- a/home-manager/completion.fish
+++ b/home-manager/completion.fish
@@ -64,3 +64,7 @@ complete -c home-manager -f -l "show-trace" -d "Print stack trace of evaluation
 complete -c home-manager -f -l "substitute"
 complete -c home-manager -f -l "no-substitute"
 complete -c home-manager -f -l "no-out-link"
+complete -c home-manager -f -l "update-input"
+complete -c home-manager -f -l "override-input"
+complete -c home-manager -f -l "experimental-features"
+complete -c home-manager -f -l "extra-experimental-features"
diff --git a/home-manager/completion.zsh b/home-manager/completion.zsh
index 5748ee83..6e20d17d 100644
--- a/home-manager/completion.zsh
+++ b/home-manager/completion.zsh
@@ -20,6 +20,10 @@ _arguments \
   '--option[option]:NAME VALUE:()' \
   '--builders[builders]:SPEC:()' \
   '--show-trace[show trace]' \
+  '--override-input[override flake input]:NAME VALUE:()' \
+  '--update-input[update flake input]:NAME:()' \
+  '--experimental-features[set experimental Nix features]:VALUE:()' \
+  '--extra-experimental-features:[append to experimental Nix features]:VALUE:()' \
   '1: :->cmds' \
   '*:: :->args' && ret=0
 
@@ -57,7 +61,11 @@ case "$state" in
           '--option[option]:NAME VALUE:()' \
           '--show-trace[show trace]' \
           '--substitute[substitute]' \
-          '--builders[builders]:SPEC:()'
+          '--builders[builders]:SPEC:()' \
+          '--override-input[override flake input]:NAME VALUE:()' \
+          '--update-input[update flake input]:NAME:()' \
+          '--experimental-features[set experimental Nix features]:VALUE:()' \
+          '--extra-experimental-features:[append to experimental Nix features]:VALUE:()'
         ;;
     esac
 esac