diff --git a/docs/config.md b/docs/config.md
index 61942560..da862e96 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -85,7 +85,7 @@ For example:
 # match all cAdvisor metrics that aren't measured in seconds
 seriesQuery: '{__name__=~"^container_.*_total",container_name!="POD",namespace!="",pod_name!=""}'
 seriesFilters:
-  isNot: "^container_.*_seconds_total"
+  - isNot: "^container_.*_seconds_total"
 ```
 
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