diff --git a/pkgs/by-name/re/regionset/package.nix b/pkgs/by-name/re/regionset/package.nix
index 547a307ea1fb..cd21a3f23873 100644
--- a/pkgs/by-name/re/regionset/package.nix
+++ b/pkgs/by-name/re/regionset/package.nix
@@ -16,9 +16,15 @@ stdenv.mkDerivation {
     sha256 = "1fgps85dmjvj41a5bkira43vs2aiivzhqwzdvvpw5dpvdrjqcp0d";
   };
 
+  prePatch = ''
+    substituteInPlace regionset.8 \
+        --replace-fail /usr/share/doc/ "$out"/share/doc/
+  '';
+
   installPhase = ''
     install -Dm755 {.,$out/bin}/regionset
     install -Dm644 {.,$out/share/man/man8}/regionset.8
+    install -Dm644 {.,$out/share/doc/regionset}/README
   '';
 
   meta = with lib; {