diff --git a/home-manager/completion.bash b/home-manager/completion.bash
index d59c8a11..bd561262 100644
--- a/home-manager/completion.bash
+++ b/home-manager/completion.bash
@@ -303,7 +303,7 @@ _home-manager_completions ()
               "-L" "--print-build-logs" \
               "--show-trace" "--flake" "--substitute" "--builders" "--version" \
               "--update-input" "--override-input" "--experimental-features" \
-              "--extra-experimental-features" "--refresh")
+              "--extra-experimental-features" "--reference-lock-file"  "--refresh")
 
     # ^ « home-manager »'s options.
 
diff --git a/home-manager/completion.zsh b/home-manager/completion.zsh
index 43cc9bdb..18250d85 100644
--- a/home-manager/completion.zsh
+++ b/home-manager/completion.zsh
@@ -26,6 +26,7 @@ _arguments \
   '--update-input[update flake input]:NAME:()' \
   '--experimental-features[set experimental Nix features]:VALUE:()' \
   '--extra-experimental-features:[append to experimental Nix features]:VALUE:()' \
+  '--reference-lock-file[flake.lock path]:VALUE:()' \
   '1: :->cmds' \
   '*:: :->args' && ret=0
 
@@ -70,6 +71,7 @@ case "$state" in
           '--override-input[override flake input]:NAME VALUE:()' \
           '--update-input[update flake input]:NAME:()' \
           '--experimental-features[set experimental Nix features]:VALUE:()' \
+          '--reference-lock-file[flake.lock path]:VALUE:()' \
           '--extra-experimental-features:[append to experimental Nix features]:VALUE:()'
         ;;
       init)
diff --git a/home-manager/home-manager b/home-manager/home-manager
index 9703505d..592182b9 100644
--- a/home-manager/home-manager
+++ b/home-manager/home-manager
@@ -1003,6 +1003,11 @@ while [[ $# -gt 0 ]]; do
             PASSTHROUGH_OPTS+=("$opt" "$1")
             shift
             ;;
+        --reference-lock-file)
+            [[ -v 1 && $1 != -* ]] || errMissingOptArg "$opt"
+            PASSTHROUGH_OPTS+=("$opt" "$1")
+            shift
+            ;;
         --extra-experimental-features)
             [[ -v 1 && $1 != -* ]] || errMissingOptArg "$opt"
             PASSTHROUGH_OPTS+=("$opt" "$1")