diff --git a/README.md b/README.md
index d695946..f90f5f7 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ This repo provides the following kernel variants, consistent with the [upstream
 
 The kernel versions are automatically kept in sync with Nixpkgs, so once the latest/LTS kernel is updated in Nixpkgs, CachyOS kernels in this repo will automatically catch up.
 
-Use `nix flake show github:xddxdd/nix-cachyos-kernel` to see the current effective versions.
+Use `nix flake show github:xddxdd/nix-cachyos-kernel/release` to see the current effective versions.
 
 The kernels ending in `-lto` has Clang+ThinLTO enabled.
 
@@ -65,6 +65,7 @@ Add the `release` branch this repo to the inputs section of your `flake.nix`:
 {
   inputs = {
     nix-cachyos-kernel.url = "github:xddxdd/nix-cachyos-kernel/release";
+    # Do not override its nixpkgs input, otherwise there can be mismatch between patches and kernel version
   }
 }
 ```
@@ -93,14 +94,14 @@ Add the repo's overlay in your NixOS configuration, this will expose the package
           { pkgs, ... }:
           {
             nixpkgs.overlays = [
-              # Build the kernels on top of nixpkgs version in your flake.
-              # Binary cache may be unavailable for the kernel/nixpkgs version combos.
-              nix-cachyos-kernel.overlays.default
-
-              # Alternatively: use the exact kernel versions as defined in this repo.
+              # Use the exact kernel versions as defined in this repo.
               # Guarantees you have binary cache.
               nix-cachyos-kernel.overlays.pinned
 
+              # Alternatively, build the kernels on top of nixpkgs version in your flake.
+              # This might cause version mismatch/build failures!
+              nix-cachyos-kernel.overlays.default
+
               # Only use one of the two overlays!
             ];
 
diff --git a/flake.nix b/flake.nix
index 83633f2..0714dc7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -78,10 +78,15 @@
           };
 
         flake = {
-          overlay = self.overlays.default;
-          overlays.default = final: prev: {
-            cachyosKernels = loadPackages prev;
-          };
+          overlay = self.overlays.pinned;
+          overlays.default =
+            builtins.warn
+              "\"nix-cachyos-kernel.overlays.default\" may cause kernel/patch version mismatch and build failure. Please use \"nix-cachyos-kernel.overlays.pinned\" instead."
+              (
+                final: prev: {
+                  cachyosKernels = loadPackages prev;
+                }
+              );
           overlays.pinned = final: prev: {
             cachyosKernels = self.legacyPackages."${final.stdenv.hostPlatform.system}";
           };