diff --git a/documentation/plain_rules.md b/documentation/plain_rules.md
index 1aec190b..b736ee4d 100644
--- a/documentation/plain_rules.md
+++ b/documentation/plain_rules.md
@@ -2,7 +2,7 @@
 
 -   [Introduction](#introduction)
 -   [EPL text](#epl-text)
--   [No signal conditions](#nosignal-conditions)
+-   [No signal conditions](#no-signal-conditions)
 -   [Actions](#actions)
     -   [String substitution syntax](#string-substitution-syntax)
     -   [SMS action](#sms-action)