diff --git a/sources/ch4.py b/sources/ch4.py
index 7adec89..06864c4 100644
--- a/sources/ch4.py
+++ b/sources/ch4.py
@@ -25,6 +25,9 @@ CRAWL_DELAY = int(getenv("MONOLITH_CH4_CRAWL_DELAY", 5))
 # Semaphore value ?
 THREADS_SEMAPHORE = int(getenv("MONOLITH_CH4_THREADS_SEMAPHORE", 1000))
 
+# Boards to crawl
+BOARDS = getenv("MONOLITH_CH4_BOARDS", "").split(",")
+
 # CONFIGURATION END #
 
 
@@ -58,7 +61,10 @@ class Chan4(object):
             self.log.debug(f"Decoded hash key: {self.hash_key}")
 
     async def run(self):
-        await self.get_board_list()
+        if not BOARDS:
+            await self.get_board_list()
+        else:
+            self.boards = BOARDS
         while True:
             await self.get_thread_lists(self.boards)
             await asyncio.sleep(CRAWL_DELAY)