diff --git a/Static-filter-syntax.md b/Static-filter-syntax.md
index de35334..0b846a1 100644
--- a/Static-filter-syntax.md
+++ b/Static-filter-syntax.md
@@ -87,4 +87,6 @@ uBO supports a special cosmetic filter which purpose is to prevent the execution
 
 `script:inject(...)`:
 
-This allows the injection of specific javascript code into pages. The `...` part is a token identifying a javascript resource from the [resource library](https://github.com/gorhill/uBlock/blob/master/assets/ublock/resources.txt). Keep in mind the resource library is completely under control of the uBO project, hence only javascript code vouched by uBO can be inserted into web pages, through the use of a valid resource token.
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+This allows the injection of specific javascript code into pages. The `...` part is a token identifying a javascript resource from the [resource library](https://github.com/gorhill/uBlock/blob/master/assets/ublock/resources.txt). Keep in mind the resource library is completely under control of the uBO project, hence only javascript code vouched by uBO can be inserted into web pages, through the use of a valid resource token.
+
+Generic `script:inject` filters are ignored: those filters **must** be specific, i.e. they must apply to specific hostnames, e.g. `example.com##script:inject(yavli-defuser.js)`.
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