diff --git a/README.md b/README.md
index b6a4685..2b40431 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,8 @@ Note that if you signal an unexpected signal to dwmblocks, it will probably
 crash. So if you disable a module, remember to also disable any cronjobs or
 other scripts that might signal to that module.
 
+Note also that all modules must have different signal numbers.
+
 # Clickable modules
 
 Like i3blocks, this build allows you to build in additional actions into your