diff --git a/home-manager/completion.bash b/home-manager/completion.bash
index de7804515..d59c8a118 100644
--- a/home-manager/completion.bash
+++ b/home-manager/completion.bash
@@ -301,7 +301,7 @@ _home-manager_completions ()
               "--verbose" "--cores" "--debug" "--impure" "--keep-failed" \
               "--keep-going" "-j" "--max-jobs" "--no-substitute" "--no-out-link" \
               "-L" "--print-build-logs" \
-              "--show-trace" "--substitute" "--builders" "--version" \
+              "--show-trace" "--flake" "--substitute" "--builders" "--version" \
               "--update-input" "--override-input" "--experimental-features" \
               "--extra-experimental-features" "--refresh")
 
diff --git a/home-manager/completion.zsh b/home-manager/completion.zsh
index 52bcce90e..43cc9bdb9 100644
--- a/home-manager/completion.zsh
+++ b/home-manager/completion.zsh
@@ -6,6 +6,7 @@ _arguments \
   '-A[attribute]:ATTRIBUTE:()' \
   '-I[search path]:PATH:_files -/' \
   '-b[backup files]:EXT:()' \
+  '--flake[flake-uri]:PATH:_files -/' \
   '--cores[cores]:NUM:()' \
   '--debug[debug]' \
   '--impure[impure]' \
@@ -53,6 +54,7 @@ case "$state" in
       build|switch)
         _arguments \
           '--cores[cores]:NUM:()' \
+          '--flake[flake-uri]:PATH:_files -/' \
           '--debug[debug]' \
           '--impure[impure]' \
           '--keep-failed[keep failed]' \