diff --git a/docs/instrumentation/memory.rst b/docs/instrumentation/memory.rst
index 3a0e8f88d6d08a27ff6fb6dc010da610bf50bb29..2674a8ced49389f89d543f19f1c3769200942bad 100644
--- a/docs/instrumentation/memory.rst
+++ b/docs/instrumentation/memory.rst
@@ -10,6 +10,9 @@ from Satella solves that problem.
 
 .. autofunction:: satella.instrumentation.memory.get_size
 
+.. warning:: Using these conditions will spawn a daemon thread to monitor the memory usage
+    in the background.
+
 Defining severity levels
 ------------------------