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+# Release 0.13 (2009-11-05)
+
+This is primarily a bug fix release. It has some new features:
+
+  - Syntactic sugar for writing nested attribute sets. Instead of
+    
+        {
+          foo = {
+            bar = 123;
+            xyzzy = true;
+          };
+          a = { b = { c = "d"; }; };
+        }
+    
+    you can write
+    
+        {
+          foo.bar = 123;
+          foo.xyzzy = true;
+          a.b.c = "d";
+        }
+    
+    This is useful, for instance, in NixOS configuration files.
+
+  - Support for Nix channels generated by Hydra, the Nix-based
+    continuous build system. (Hydra generates NAR archives on the fly,
+    so the size and hash of these archives isn’t known in advance.)
+
+  - Support `i686-linux` builds directly on `x86_64-linux` Nix
+    installations. This is implemented using the `personality()`
+    syscall, which causes `uname` to return `i686` in child processes.
+
+  - Various improvements to the `chroot` support. Building in a `chroot`
+    works quite well now.
+
+  - Nix no longer blocks if it tries to build a path and another process
+    is already building the same path. Instead it tries to build another
+    buildable path first. This improves parallelism.
+
+  - Support for large (\> 4 GiB) files in NAR archives.
+
+  - Various (performance) improvements to the remote build mechanism.
+
+  - New primops: `builtins.addErrorContext` (to add a string to stack
+    traces — useful for debugging), `builtins.isBool`,
+    `builtins.isString`, `builtins.isInt`, `builtins.intersectAttrs`.
+
+  - OpenSolaris support (Sander van der Burg).
+
+  - Stack traces are no longer displayed unless the `--show-trace`
+    option is used.
+
+  - The scoping rules for `inherit
+                    (e) ...` in recursive attribute sets have changed. The expression e
+    can now refer to the attributes defined in the containing set.