diff --git a/solutions/system_design/web_crawler/README.md b/solutions/system_design/web_crawler/README.md
index e6e79ad224..eac0311e2a 100644
--- a/solutions/system_design/web_crawler/README.md
+++ b/solutions/system_design/web_crawler/README.md
@@ -115,7 +115,7 @@ class PagesDataStore(object):
         """Remove the given link from `links_to_crawl`."""
         ...
 
-    def reduce_priority_link_to_crawl(self, url)
+    def reduce_priority_link_to_crawl(self, url):
         """Reduce the priority of a link in `links_to_crawl` to avoid cycles."""
         ...