diff --git a/docutranslate/cacher/document_cacher.py b/docutranslate/cacher/document_cacher.py
index 0805765..6e78983 100644
--- a/docutranslate/cacher/document_cacher.py
+++ b/docutranslate/cacher/document_cacher.py
@@ -1,5 +1,8 @@
+import os
+
 from docutranslate.converter import Document
 
+# DOCUTRANSLATE_CHACHE_NUM=os.getenv("DOCUTRANSLATE_CHACHE_NUM")
 
 class DocumentCacher:
     def __init__(self):
@@ -17,5 +20,8 @@ class DocumentCacher:
         self.cache_dict[hash_code] = result
         return result
 
+    def clear(self):
+        self.cache_dict.clear()
+
 
 document_cacher_global = DocumentCacher()