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-rw-r--r--modules/caddyhttp/celmatcher.go3
1 files changed, 2 insertions, 1 deletions
diff --git a/modules/caddyhttp/celmatcher.go b/modules/caddyhttp/celmatcher.go
index 19c7bca..bede78f 100644
--- a/modules/caddyhttp/celmatcher.go
+++ b/modules/caddyhttp/celmatcher.go
@@ -42,7 +42,8 @@ func init() {
// MatchExpression matches requests by evaluating a
// [CEL](https://github.com/google/cel-spec) expression.
// This enables complex logic to be expressed using a comfortable,
-// familiar syntax.
+// familiar syntax. Please refer to
+// [the standard definitions of CEL functions and operators](https://github.com/google/cel-spec/blob/master/doc/langdef.md#standard-definitions).
//
// This matcher's JSON interface is actually a string, not a struct.
// The generated docs are not correct because this type has custom