1 files changed, 38 insertions, 0 deletions
diff --git a/src/nix/flake-lock.md b/src/nix/flake-lock.md
new file mode 100644
index 000000000..2af0ad81e
--- /dev/null
+++ b/src/nix/flake-lock.md
@@ -0,0 +1,38 @@
+R""(
+
+# Examples
+
+* Update the `nixpkgs` and `nix` inputs of the flake in the current
+  directory:
+
+  ```console
+  # nix flake lock --update-input nixpkgs --update-input nix
+  * Updated 'nix': 'github:NixOS/nix/9fab14adbc3810d5cc1f88672fde1eee4358405c' -> 'github:NixOS/nix/8927cba62f5afb33b01016d5c4f7f8b7d0adde3c'
+  * Updated 'nixpkgs': 'github:NixOS/nixpkgs/3d2d8f281a27d466fa54b469b5993f7dde198375' -> 'github:NixOS/nixpkgs/a3a3dda3bacf61e8a39258a0ed9c924eeca8e293'
+  ```
+
+# Description
+
+This command updates the lock file of a flake (`flake.lock`) so that
+it contains a lock for every flake input specified in
+`flake.nix`. Existing lock file entries are not updated unless
+required by a flag such as `--update-input`.
+
+Note that every command that operates on a flake will also update the
+lock file if needed, and supports the same flags. Therefore,
+
+```console
+# nix flake lock --update-input nixpkgs
+# nix build
+```
+
+is equivalent to:
+
+```console
+# nix build --update-input nixpkgs
+```
+
+Thus, this command is only useful if you want to update the lock file
+separately from any other action such as building.
+
+)""