diff --git a/pkgs/additional/koreader-from-src/sources.nix b/pkgs/additional/koreader-from-src/sources.nix
index 8e28c2e2..56b64a22 100644
--- a/pkgs/additional/koreader-from-src/sources.nix
+++ b/pkgs/additional/koreader-from-src/sources.nix
@@ -167,13 +167,14 @@ in
     #   source.hash = "sha256-R76EREtHsqcoKxKrgT8gfEf9pIWdLTBXvF9cDvjEf3E=";
     #   # package = zeromq4;  # despite the name, it's libzmq.so.5 instead of libzmq.so.4
     # };
-    lj-wpaclient = {
-      source.url = "https://github.com/koreader/lj-wpaclient.git";
-      source.rev = "2f93beb3071e6ebb57c783bd5b92f83aa5ebb757";
-      source.hash = "sha256-ilJviGZTvL2i1TN5lHQ4eA9pFiM7NlXD+v9ofv520b8=";
-      machineAgnostic = true;
-      # package: not in nixpkgs; not even a non-luajit `wpaclient`
-    };
+    # lj-wpaclient = {
+    #   # only needed for select targets (e.g. kobo)
+    #   source.url = "https://github.com/koreader/lj-wpaclient.git";
+    #   source.rev = "2f93beb3071e6ebb57c783bd5b92f83aa5ebb757";
+    #   source.hash = "sha256-ilJviGZTvL2i1TN5lHQ4eA9pFiM7NlXD+v9ofv520b8=";
+    #   machineAgnostic = true;
+    #   # package: not in nixpkgs; not even a non-luajit `wpaclient`
+    # };
     lodepng = {
       source.url = "https://github.com/lvandeve/lodepng.git";
       source.rev = "d398e0f10d152a5d17fa30463474dc9f56523f9c";
@@ -231,7 +232,7 @@ in
       source.url = "https://github.com/nmoinvaz/minizip";
       source.rev = "0b46a2b4ca317b80bc53594688883f7188ac4d08";
       source.hash = "sha256-P/3MMMGYDqD9NmkYvw/thKpUNa3wNOSlBBjANHSonAg=";
-      # package = libAndDev minizip;  # weird #include incompatibilities... maybe resolvable.
+      # package = libAndDev minizip;  # weird #include incompatibilities... maybe resolvable (looks like this is actually minizip-ng! but from 2015 and slightly patched; used as a lib for mupdf).
     };
     mupdf = {
       source.url = "https://github.com/ArtifexSoftware/mupdf.git";