diff --git a/internal/api/client/filters/v1/validate.go b/internal/api/client/filters/v1/validate.go
index 9d72e3ffa..60823462b 100644
--- a/internal/api/client/filters/v1/validate.go
+++ b/internal/api/client/filters/v1/validate.go
@@ -60,7 +60,7 @@ func validateNormalizeCreateUpdateFilter(form *apimodel.FilterCreateUpdateReques
 		}
 	}
 
-	// Ensure no zero duration is set.
+	// Interpret zero as indefinite duration..
 	if form.ExpiresIn != nil && *form.ExpiresIn == 0 {
 		form.ExpiresIn = nil
 	}
diff --git a/internal/api/client/filters/v2/filterpost.go b/internal/api/client/filters/v2/filterpost.go
index 27ac93ab7..9660f2f18 100644
--- a/internal/api/client/filters/v2/filterpost.go
+++ b/internal/api/client/filters/v2/filterpost.go
@@ -239,7 +239,7 @@ func validateNormalizeCreateFilter(form *apimodel.FilterCreateRequestV2) error {
 		}
 	}
 
-	// Ensure no zero duration is set.
+	// Interpret zero as indefinite duration..
 	if form.ExpiresIn != nil && *form.ExpiresIn == 0 {
 		form.ExpiresIn = nil
 	}
diff --git a/internal/api/client/filters/v2/filterput.go b/internal/api/client/filters/v2/filterput.go
index 86e026e15..3805d4f80 100644
--- a/internal/api/client/filters/v2/filterput.go
+++ b/internal/api/client/filters/v2/filterput.go
@@ -283,7 +283,7 @@ func validateNormalizeUpdateFilter(form *apimodel.FilterUpdateRequestV2) error {
 		}
 	}
 
-	// Ensure no zero duration is set.
+	// Interpret zero as indefinite duration..
 	if form.ExpiresIn != nil && *form.ExpiresIn == 0 {
 		form.ExpiresIn = nil
 	}