diff --git a/docs/usage.rst b/docs/usage.rst
index af88af69a380289e37f96002ebc50c9fd2e8bdb0..ebd8324866702f04db6f6776d970de58125e40db 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -3,6 +3,9 @@ Usage
 
 MiniJSON implements the same interface as json or yaml, namely:
 
+.. warning:: Cycles are not automatically detected. They might make the application hang
+    or cause an MemoryError.
+
 .. autofunction:: minijson.loads
 
 .. autofunction:: minijson.dumps