diff --git a/README.md b/README.md
index 163b40d9..4144612e 100644
--- a/README.md
+++ b/README.md
@@ -59,6 +59,16 @@ The extension launches the LSP automatically using the `ndc` binary. If `ndc` is
 that VS Code uses (common when installed via a shell like fish), set the `andy-cpp.ndcPath` setting
 to the full path of the binary.
 
+### JetBrains IDEs (RustRover, IntelliJ, …)
+
+JetBrains IDEs are supported by importing `ext/andy-cpp` as a TextMate bundle (syntax
+highlighting) and connecting the LSP4IJ plugin to `ndc lsp` (diagnostics, hover,
+completion, inlay type hints, go to definition). See the
+[editor support page](https://timfennis.github.io/andy-cpp/tooling/editor-support.html)
+in the manual for setup instructions.
+
+### Other editors
+
 If you prefer a different editor, you can start the language server manually over stdio:
 
 ```bash
diff --git a/ext/andy-cpp/syntaxes/andy-cpp.tmLanguage.json b/ext/andy-cpp/syntaxes/andy-cpp.tmLanguage.json
index 04f801eb..2d68ee24 100644
--- a/ext/andy-cpp/syntaxes/andy-cpp.tmLanguage.json
+++ b/ext/andy-cpp/syntaxes/andy-cpp.tmLanguage.json
@@ -64,7 +64,7 @@
         {
           "comment": "function definition",
           "name": "meta.function.definition.andy-cpp",
-          "begin": "\\b((pure)\\s)?(fn)\\s+([A-Za-z_][A-Za-z_0-9]*)",
+          "begin": "\\b((pure)\\s)?(fn)\\s+([A-Za-z_][A-Za-z_0-9]*\\??)",
           "patterns": [
             {
               "include": "#expression"
@@ -126,11 +126,21 @@
           "begin": "(//)",
           "end": "$",
           "name": "comment.line.double-slash.andy-cpp"
+        },
+        {
+          "begin": "(#!)",
+          "end": "$",
+          "name": "comment.line.shebang.andy-cpp"
         }
       ]
     },
     "numbers": {
       "patterns": [
+        {
+          "comment": "Complex literals (imaginary part), e.g. `3i` or `2.5j`",
+          "match": "\\b([0-9][0-9_]*(\\.[0-9][0-9_]*)?[ij])\\b",
+          "name": "constant.numeric.complex.andy-cpp"
+        },
         {
           "comment": "Floats",
           "match": "\\b([0-9][0-9_]*\\.[0-9][0-9_]*)\\b",
diff --git a/ext/lsp4ij-ndc/template.json b/ext/lsp4ij-ndc/template.json
new file mode 100644
index 00000000..023a3f84
--- /dev/null
+++ b/ext/lsp4ij-ndc/template.json
@@ -0,0 +1,17 @@
+{
+  "name": "Andy C++ (ndc)",
+  "programArgs": {
+    "default": "ndc lsp --stdio"
+  },
+  "fileTypeMappings": [
+    {
+      "fileType": {
+        "name": "ndc",
+        "patterns": [
+          "*.ndc"
+        ]
+      },
+      "languageId": "ndc"
+    }
+  ]
+}
diff --git a/manual/src/tooling/editor-support.md b/manual/src/tooling/editor-support.md
index d30a2ebc..fd2eff6a 100644
--- a/manual/src/tooling/editor-support.md
+++ b/manual/src/tooling/editor-support.md
@@ -27,6 +27,32 @@ launches it automatically. Any LSP-capable editor can use it by pointing at the
   variable declarations in the file.
 - **Go-to-definition** — jump from a variable or function usage to its declaration.
 
+## JetBrains IDEs (RustRover, IntelliJ, …)
+
+JetBrains IDEs are supported without a dedicated plugin, in two independent parts.
+
+**Syntax highlighting** — the bundled *TextMate Bundles* plugin can import the VS Code
+extension directory directly:
+
+1. Go to *Settings → Editor → TextMate Bundles*, click **+**, and select the
+   `ext/andy-cpp` directory from the repository.
+2. Open a `.ndc` file — it should highlight immediately. If it renders as plain text,
+   check *Settings → Editor → File Types* and make sure `*.ndc` is not claimed by
+   another file type.
+
+**Language intelligence** — the [LSP4IJ](https://plugins.jetbrains.com/plugin/23257-lsp4ij)
+plugin connects the IDE to the language server:
+
+1. Build the binary with `cargo build --release`, then install **LSP4IJ** from the
+   plugin marketplace.
+2. Open the *Language Servers* tool window, click **+**, and configure a new server:
+   - **Command**: `/path/to/andy-cpp/target/release/ndc lsp --stdio`
+   - In the **Mappings** tab, add a *File name patterns* mapping with pattern `*.ndc`
+     and language id `ndc`.
+3. Open a `.ndc` file. The server starts automatically and provides everything listed
+   above. `ext/lsp4ij-ndc/template.json` in the repository contains the same
+   configuration as a reference.
+
 ## Notes
 
 - The server uses full-document synchronisation and re-analyses on each edit.