diff --git a/pkgs/tools/system/bottom/default.nix b/pkgs/tools/system/bottom/default.nix
index 12367949e9e8..8c5e2833212c 100644
--- a/pkgs/tools/system/bottom/default.nix
+++ b/pkgs/tools/system/bottom/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, rustPlatform, darwin }:
+{ stdenv, fetchFromGitHub, rustPlatform, darwin, installShellFiles }:
 
 rustPlatform.buildRustPackage rec {
   pname = "bottom";
@@ -11,12 +11,18 @@ rustPlatform.buildRustPackage rec {
     sha256 = "sha256-Gc2bL7KqDqab0hCCOi2rtEw+5r0bSETzTipLLdX/ipk=";
   };
 
+  nativeBuildInputs = [ installShellFiles ];
+
   buildInputs = stdenv.lib.optional stdenv.hostPlatform.isDarwin darwin.apple_sdk.frameworks.IOKit;
 
   cargoSha256 = "sha256-Bdkq3cTuziTQ7/BkvuBHbfuxRIXnz4h2OadoAGNTBc0=";
 
   doCheck = false;
 
+  postInstall = ''
+    installShellCompletion $releaseDir/build/bottom-*/out/btm.{bash,fish} --zsh $releaseDir/build/bottom-*/out/_btm
+  '';
+
   meta = with stdenv.lib; {
     description = "A cross-platform graphical process/system monitor with a customizable interface";
     homepage = "https://github.com/ClementTsang/bottom";
@@ -25,4 +31,3 @@ rustPlatform.buildRustPackage rec {
     platforms = platforms.unix;
   };
 }
-