diff --git a/README.md b/README.md
index 3a84fb78..56d56521 100644
--- a/README.md
+++ b/README.md
@@ -148,6 +148,10 @@ inhibit_rules:
   target_match:
     severity: 'warning'
   # Apply inhibition if the alertname is the same.
+  # CAUTION: 
+  #   If all label names listed in `equal` are missing 
+  #   from both the source and target alerts,
+  #   the inhibition rule will apply!
   equal: ['alertname']
 
 
diff --git a/doc/examples/simple.yml b/doc/examples/simple.yml
index 921e718e..8f0f4972 100644
--- a/doc/examples/simple.yml
+++ b/doc/examples/simple.yml
@@ -97,6 +97,10 @@ inhibit_rules:
   target_match:
     severity: 'warning'
   # Apply inhibition if the alertname is the same.
+  # CAUTION: 
+  #   If all label names listed in `equal` are missing 
+  #   from both the source and target alerts,
+  #   the inhibition rule will apply!
   equal: ['alertname', 'cluster', 'service']