diff --git a/event/capabilities.d.ts b/event/capabilities.d.ts
index 7f1dce05..27164a5f 100644
--- a/event/capabilities.d.ts
+++ b/event/capabilities.d.ts
@@ -117,7 +117,8 @@ export enum DisappearingType {
 
 export interface DisappearingTimerCapability {
 	types: DisappearingType[]
-	timers: milliseconds[]
+	/** Allowed timer values. If omitted, any timer is allowed. */
+	timers?: milliseconds[]
 	/**
 	 * Whether clients should omit the empty disappearing_timer object in messages that they don't want to disappear
 	 *
diff --git a/event/capabilities.go b/event/capabilities.go
index 20f87bce..ebedb6a2 100644
--- a/event/capabilities.go
+++ b/event/capabilities.go
@@ -71,7 +71,7 @@ type FileFeatureMap map[CapabilityMsgType]*FileFeatures
 
 type DisappearingTimerCapability struct {
 	Types  []DisappearingType      `json:"types"`
-	Timers []jsontime.Milliseconds `json:"timers"`
+	Timers []jsontime.Milliseconds `json:"timers,omitempty"`
 
 	OmitEmptyTimer bool `json:"omit_empty_timer,omitempty"`
 }
@@ -80,7 +80,7 @@ func (dtc *DisappearingTimerCapability) Supports(content *BeeperDisappearingTime
 	if dtc == nil || content.Type == DisappearingTypeNone {
 		return true
 	}
-	return slices.Contains(dtc.Types, content.Type) && slices.Contains(dtc.Timers, content.Timer)
+	return slices.Contains(dtc.Types, content.Type) && (dtc.Timers == nil || slices.Contains(dtc.Timers, content.Timer))
 }
 
 type CapabilityMsgType = MessageType