diff --git a/doc/functional-tests.md b/doc/functional-tests.md
--- a/doc/functional-tests.md
+++ b/doc/functional-tests.md
@@ -204,8 +204,8 @@
 ```
 
 Often while debugging rpc calls from functional tests, the test might reach timeout before
-process can return a response. Use `--timeout-factor 0` to disable all rpc timeouts for that particular
-functional test. Ex: `test/functional/test_runner.py wallet_hd --timeout-factor 0`.
+process can return a response. Use `--timeout-factor=0` to disable all rpc timeouts for that particular
+functional test. Ex: `test/functional/test_runner.py wallet_hd --timeout-factor=0`.
 
 ### Benchmarking and profiling with perf