diff --git a/weak/src/commonMain/kotlin/WeakRef.kt b/weak/src/commonMain/kotlin/WeakRef.kt
index 8c136f5..6bc1e9d 100644
--- a/weak/src/commonMain/kotlin/WeakRef.kt
+++ b/weak/src/commonMain/kotlin/WeakRef.kt
@@ -111,6 +111,10 @@ interface WeakRef<out T> {
  *
  * The exact behavior of the returned object is platform-specific.
  *
+ * ### Thread-safety
+ *
+ * The reference returned by this function is thread-safe.
+ *
  * @see SoftRef For implementing caches
  */
 expect fun <T> WeakRef(value: T): WeakRef<T>
@@ -132,6 +136,10 @@ expect fun <T> WeakRef(value: T): WeakRef<T>
  *
  * The exact behavior of the returned object is platform-specific.
  *
+ * ### Thread-safety
+ *
+ * The reference returned by this function is thread-safe.
+ *
  * @see WeakRef For implementing mappers
  */
 @Suppress("FunctionName")