diff --git a/README.md b/README.md
index 0280734..9414835 100644
--- a/README.md
+++ b/README.md
@@ -23,4 +23,6 @@ for debugging purposes.
 - `--no-namespace`: Disables generation of namespaces.
 - `-nn`: Alias for `--no-namespace`.
 - `--define-prefix <prefix>`: Sets the prefix for generated `#define` guards.
-- `-dp`: Alias for `--define-prefix`.
\ No newline at end of file
+- `-dp`: Alias for `--define-prefix`.
+- `--indent <indent>`: Sets the indentation string for generated files. 2 spaces by default.
+- `-i`: Alias for `--indent`.
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 4804eb7..72fe991 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -144,6 +144,16 @@ int main(int argc, char* argv[]) {
       codeProperties.headerGuardType_ = CodeProperties::HeaderGuard::Ifndef;
       continue;
     }
+    if (args[i] == "--indent" || args[i] == "-i") {
+      if (i + 1 < argc) {
+        codeProperties.indent_ = args[i + 1];
+        i += 1;
+        continue;
+      } else {
+        std::cerr << "Error: --indent requires an argument." << std::endl;
+        return 1;
+      }
+    }
     if (args[i].starts_with('-')) {
       std::cerr << "Error: Unknown option " << args[i] << std::endl;
       return 1;