diff --git a/changelog.md b/changelog.md
index 903038b..2b395f0 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,7 @@
+# 1.0.6
+
+-    PreprocessorExt: add option `multithread`
+ 
 # 1.0.5
 
 -    PreprocessorExt: fixed the definition of `run_in_thread`, which is a decorator for the file processing function.
diff --git a/foliant/preprocessors/utils/preprocessor_ext.py b/foliant/preprocessors/utils/preprocessor_ext.py
index db2cace..e9f16d3 100644
--- a/foliant/preprocessors/utils/preprocessor_ext.py
+++ b/foliant/preprocessors/utils/preprocessor_ext.py
@@ -14,19 +14,30 @@
 MAX_THREADS = max(1, os.cpu_count() - 2)
 thread_semaphore = threading.Semaphore(MAX_THREADS)
 
-def run_in_thread(fn):
-    @wraps(fn)
-    def run(*args, **kwargs):
-        def wrapper():
-            try:
-                fn(*args, **kwargs)
-            finally:
-                thread_semaphore.release()
-        
-        thread_semaphore.acquire()
-        threading.Thread(target=wrapper, daemon=True).start()
+def run_in_thread(enabled=True):
+    """
+    If enabled=False, returns the original function immediately without wrapping.
+    """
+    def actual_decorator(fn):
+        if not enabled:
+            return fn
+
+        @wraps(fn)
+        def wrapper(*args, **kwargs):
+            def thread_task():
+                try:
+                    fn(*args, **kwargs)
+                finally:
+                    thread_semaphore.release()
+
+            thread_semaphore.acquire()
+            thread = threading.Thread(target=thread_task, daemon=True)
+            thread.start()
+            return thread
 
-    return run
+        return wrapper
+    
+    return actual_decorator
 
 def allow_fail(msg: str = 'Failed to process tag. Skipping.') -> Callable:
     """
@@ -159,7 +170,8 @@ def _process_tags_for_all_files(self,
         '''
         self.logger.info(log_msg)
 
-        @run_in_thread
+        multithread = self.context['config'].get('multithread', False)
+        @run_in_thread(enabled=multithread)
         def process(self, markdown_file_path):
             self.current_filepath = Path(markdown_file_path)
             self.current_filename = str(self.current_filepath.
@@ -193,7 +205,8 @@ def _process_all_files(self,
         '''Apply function func to all Markdown-files in the working dir'''
         self.logger.info(log_msg)
 
-        @run_in_thread
+        multithread = self.context['config'].get('multithread', False)
+        @run_in_thread(enabled=multithread)
         def process(markdown_file_path):
             self.current_filepath = Path(markdown_file_path)
             self.current_filename = str(self.current_filepath.
diff --git a/setup.py b/setup.py
index e83aa31..f89441d 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,7 @@
     description=SHORT_DESCRIPTION,
     long_description=LONG_DESCRIPTION,
     long_description_content_type='text/markdown',
-    version='1.0.5',
+    version='1.0.6',
     author='Daniil Minukhin',
     author_email='ddddsa@gmail.com',
     url='https://github.com/foliant-docs/foliantcontrib.utils',