diff --git a/doc-src/features/passthrough.html b/doc-src/features/passthrough.html
index 3da8692c6..7b377c823 100644
--- a/doc-src/features/passthrough.html
+++ b/doc-src/features/passthrough.html
@@ -68,7 +68,7 @@ Here are some other examples for ignore patterns:
 --ignore "^example.com:"
 
 # Ignore everything but example.com and mitmproxy.org:
---ignore "^(?!example\.com)(?!mitmproxy\.org)"
+--ignore '^(?!example\.com)(?!mitmproxy\.org)'
     
 # Transparent mode:
 --ignore 17\.178\.96\.59:443