diff --git a/krebs/5pkgs/simple/brain/default.nix b/krebs/5pkgs/simple/brain/default.nix
index 9b125862b..bf52da75f 100644
--- a/krebs/5pkgs/simple/brain/default.nix
+++ b/krebs/5pkgs/simple/brain/default.nix
@@ -1,4 +1,4 @@
-{ pass, write, writeDash, ... }:
+{ pass, runCommand, write, writeDash, ... }:
 
 write "brain" {
   "/bin/brain".link = writeDash "brain" ''
@@ -9,4 +9,14 @@ write "brain" {
     PASSWORD_STORE_DIR=$HOME/brain \
     exec ${pass}/bin/passmenu $@
   '';
+  "/share/bash-completion/completions/brain".link =
+    runCommand "brain-completions" {
+    } /* sh */ ''
+      sed -r '
+        s/\<_pass?(_|\>)/_brain\1/g
+        s/\<__password_store/_brain/g
+        s/\<pass\>/brain/
+        s/\$HOME\/\.password-store/$HOME\/brain/
+      ' < ${pass}/share/bash-completion/completions/pass > $out
+    '';
 }