diff --git a/config/database.yml.example b/config/database.yml.example
index 9fdccac06..e7963e887 100644
--- a/config/database.yml.example
+++ b/config/database.yml.example
@@ -1,4 +1,4 @@
-# Default setup is given for MySQL 5.7.7 or later.
+# Default setup is given for MySQL 8.0 or later.
 # Examples for PostgreSQL, SQLite3 and SQL Server can be found at the end.
 # Line indentation must be 2 spaces (no tabs).
 
@@ -10,12 +10,10 @@ production:
   host: localhost
   username: root
   password: ""
-  # Use "utf8" instead of "utfmb4" for MySQL prior to 5.7.7
   encoding: utf8mb4
   variables:
     # Recommended `transaction_isolation` for MySQL to avoid concurrency issues is
     # `READ-COMMITTED`.
-    # In case of MySQL lower than 8, the variable name is `tx_isolation`.
     # See https://www.redmine.org/projects/redmine/wiki/MySQL_configuration
     transaction_isolation: "READ-COMMITTED"
 
@@ -26,7 +24,6 @@ development:
   host: localhost
   username: root
   password: ""
-  # Use "utf8" instead of "utfmb4" for MySQL prior to 5.7.7
   encoding: utf8mb4
   variables:
     transaction_isolation: "READ-COMMITTED"
@@ -41,7 +38,6 @@ test:
   host: localhost
   username: root
   password: ""
-  # Use "utf8" instead of "utfmb4" for MySQL prior to 5.7.7
   encoding: utf8mb4
   variables:
     transaction_isolation: "READ-COMMITTED"