diff --git a/litex/build/tools.py b/litex/build/tools.py
index 50fce4609..3de7c6b1a 100644
--- a/litex/build/tools.py
+++ b/litex/build/tools.py
@@ -121,3 +121,8 @@ def generated_banner(line_comment="//"):
     r += "{}\n".format(datetime.datetime.fromtimestamp(time.time()).strftime("%Y-%m-%d %H:%M:%S"))
     r += line_comment + "-"*80 + "\n"
     return r
+
+
+def deprecated_warning(msg):
+    print("[WARNING] Deprecated, please update " + msg)
+    time.sleep(2) # annoy user to force update :)