diff --git a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDefaultErrorMessages.kt b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDefaultErrorMessages.kt
index 29a934b068a..e572aa5b90e 100644
--- a/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDefaultErrorMessages.kt
+++ b/compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDefaultErrorMessages.kt
@@ -18,10 +18,13 @@ import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.AMBIGUITY
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.ANNOTATION_CLASS_MEMBER
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.ANNOTATION_PARAMETER_DEFAULT_VALUE_MUST_BE_CONSTANT
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.ANY_METHOD_IMPLEMENTED_IN_INTERFACE
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.ARRAY_EQUALITY_OPERATOR_CAN_BE_REPLACED_WITH_EQUALS
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.ASSIGN_OPERATOR_AMBIGUITY
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.BREAK_OR_CONTINUE_OUTSIDE_A_LOOP
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.CLASS_IN_SUPERTYPE_FOR_ENUM
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.CONFLICTING_OVERLOADS
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.CAN_BE_REPLACED_WITH_OPERATOR_ASSIGNMENT
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.CAN_BE_VAL
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.CONSTRUCTOR_IN_INTERFACE
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.CONSTRUCTOR_IN_OBJECT
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.CYCLIC_CONSTRUCTOR_DELEGATION_CALL
@@ -29,6 +32,7 @@ import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.DELEGATION_IN_INT
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.DELEGATION_SUPER_CALL_IN_ENUM_CONSTRUCTOR
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.DEPRECATED_MODIFIER_PAIR
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.DESERIALIZATION_ERROR
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.EMPTY_RANGE
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.ENUM_AS_SUPERTYPE
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.ERROR_FROM_JAVA_RESOLUTION
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.EXPLICIT_DELEGATION_CALL_REQUIRED
@@ -71,7 +75,14 @@ import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.QUALIFIED_SUPERTY
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.RECURSION_IN_IMPLICIT_TYPES
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.RECURSION_IN_SUPERTYPES
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.REDECLARATION
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.REDUNDANT_CALL_OF_CONVERSION_METHOD
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.REDUNDANT_EXPLICIT_TYPE
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.REDUNDANT_MODALITY_MODIFIER
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.REDUNDANT_MODIFIER
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.REDUNDANT_RETURN_UNIT_TYPE
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.REDUNDANT_SETTER_PARAMETER_TYPE
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.REDUNDANT_SINGLE_EXPRESSION_STRING_TEMPLATE
+import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.REDUNDANT_VISIBILITY_MODIFIER
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.REPEATED_MODIFIER
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.RETURN_NOT_ALLOWED
 import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors.SEALED_CLASS_CONSTRUCTOR_CALL
@@ -275,17 +286,17 @@ class FirDefaultErrorMessages : DefaultErrorMessages.Extension {
             map.put(FirErrors.WRONG_IMPLIES_CONDITION, "Wrong implies condition")
 
             // Extended checkers group
-//            map.put(REDUNDANT_VISIBILITY_MODIFIER, ...) // &
-//            map.put(REDUNDANT_MODALITY_MODIFIER, ...) // &
-//            map.put(REDUNDANT_RETURN_UNIT_TYPE, ...) // &
-//            map.put(REDUNDANT_EXPLICIT_TYPE, ...) // &
-//            map.put(REDUNDANT_SINGLE_EXPRESSION_STRING_TEMPLATE, ...) // &
-//            map.put(CAN_BE_VAL, ...) // &
-//            map.put(CAN_BE_REPLACED_WITH_OPERATOR_ASSIGNMENT, ...) // &
-//            map.put(REDUNDANT_CALL_OF_CONVERSION_METHOD, ...) // &
-//            map.put(ARRAY_EQUALITY_OPERATOR_CAN_BE_REPLACED_WITH_EQUALS, ...) // &
-//            map.put(EMPTY_RANGE, ...) // &
-//            map.put(REDUNDANT_SETTER_PARAMETER_TYPE, ...) // &
+            map.put(REDUNDANT_VISIBILITY_MODIFIER, "redundant visibility modifier")
+            map.put(REDUNDANT_MODALITY_MODIFIER, "redundant modality modifier")
+            map.put(REDUNDANT_RETURN_UNIT_TYPE, "redundant return 'unit' type")
+            map.put(REDUNDANT_EXPLICIT_TYPE, "redundant explicit type")
+            map.put(REDUNDANT_SINGLE_EXPRESSION_STRING_TEMPLATE, "redundant string template")
+            map.put(CAN_BE_VAL, "'var' can be 'val'")
+            map.put(CAN_BE_REPLACED_WITH_OPERATOR_ASSIGNMENT, "assignment can be replaced with operator assignment")
+            map.put(REDUNDANT_CALL_OF_CONVERSION_METHOD, "redundant call of conversion method")
+            map.put(ARRAY_EQUALITY_OPERATOR_CAN_BE_REPLACED_WITH_EQUALS, "Replace '==' with 'Arrays.equals'")
+            map.put(EMPTY_RANGE, "range is empty")
+            map.put(REDUNDANT_SETTER_PARAMETER_TYPE, "redundant setter parameter type")
         }
     }
 }