diff --git a/slog-handler-guide/README.md b/slog-handler-guide/README.md
index c8fd0d8..8ab958a 100644
--- a/slog-handler-guide/README.md
+++ b/slog-handler-guide/README.md
@@ -853,7 +853,7 @@
 server, logs provide the most detailed way to understand its behavior.
 Therefore, your handler should be robust to bad input.
 
-For example, the usual advice when when a function discovers a problem,
+For example, the usual advice when a function discovers a problem,
 like an invalid argument, is to panic or return an error.
 The built-in handlers do not follow that advice.
 Few things are more frustrating than being unable to debug a problem that