diff --git a/src/ameba/rule/performance/chained_call_with_no_bang.cr b/src/ameba/rule/performance/chained_call_with_no_bang.cr
index d7f827ae..22a57c78 100644
--- a/src/ameba/rule/performance/chained_call_with_no_bang.cr
+++ b/src/ameba/rule/performance/chained_call_with_no_bang.cr
@@ -25,7 +25,7 @@ module Ameba::Rule::Performance
   # YAML configuration example:
   #
   # ```
-  # Performance/ChainedCallWithNoBang
+  # Performance/ChainedCallWithNoBang:
   #   Enabled: true
   #   CallNames:
   #     - uniq
diff --git a/src/ameba/rule/performance/compact_after_map.cr b/src/ameba/rule/performance/compact_after_map.cr
index 77f542cf..63184498 100644
--- a/src/ameba/rule/performance/compact_after_map.cr
+++ b/src/ameba/rule/performance/compact_after_map.cr
@@ -16,7 +16,7 @@ module Ameba::Rule::Performance
   # YAML configuration example:
   #
   # ```
-  # Performance/CompactAfterMap
+  # Performance/CompactAfterMap:
   #   Enabled: true
   # ```
   class CompactAfterMap < Base
diff --git a/src/ameba/rule/performance/flatten_after_map.cr b/src/ameba/rule/performance/flatten_after_map.cr
index 631c656d..18ee2f8a 100644
--- a/src/ameba/rule/performance/flatten_after_map.cr
+++ b/src/ameba/rule/performance/flatten_after_map.cr
@@ -16,7 +16,7 @@ module Ameba::Rule::Performance
   # YAML configuration example:
   #
   # ```
-  # Performance/FlattenAfterMap
+  # Performance/FlattenAfterMap:
   #   Enabled: true
   # ```
   class FlattenAfterMap < Base
diff --git a/src/ameba/rule/performance/map_instead_of_block.cr b/src/ameba/rule/performance/map_instead_of_block.cr
index 5e803617..377130fc 100644
--- a/src/ameba/rule/performance/map_instead_of_block.cr
+++ b/src/ameba/rule/performance/map_instead_of_block.cr
@@ -19,7 +19,7 @@ module Ameba::Rule::Performance
   # YAML configuration example:
   #
   # ```
-  # Performance/MapInsteadOfBlock
+  # Performance/MapInsteadOfBlock:
   #   Enabled: true
   # ```
   class MapInsteadOfBlock < Base