diff --git a/core/builtins/src/kotlin/Range.kt b/core/builtins/src/kotlin/Range.kt
index 4704f1bb9b6..825e688ce2a 100644
--- a/core/builtins/src/kotlin/Range.kt
+++ b/core/builtins/src/kotlin/Range.kt
@@ -33,9 +33,9 @@ public interface Range<T : Comparable<T>> {
     public val end: T
 
     /**
-     * Checks if the specified value belongs to the range.
+     * Checks if the specified [value] belongs to the range.
      */
-    public operator fun contains(item: T): Boolean
+    public operator fun contains(value: T): Boolean
 
     /**
      * Checks if the range is empty.
@@ -65,12 +65,12 @@ public interface ClosedRange<T: Comparable<T>> : Range<T> {
     public val endInclusive: T
 
     /**
-     * Checks if the specified value belongs to the range.
+     * Checks whether the specified [value] belongs to the range.
      */
-    public override operator fun contains(item: T): Boolean = item >= start && item <= endInclusive
+    public override operator fun contains(value: T): Boolean = value >= start && value <= endInclusive
 
     /**
-     * Checks if the range is empty.
+     * Checks whether the range is empty.
      */
     public override fun isEmpty(): Boolean = start > endInclusive
 }
diff --git a/core/builtins/src/kotlin/Ranges.kt b/core/builtins/src/kotlin/Ranges.kt
index 4798e9d0c51..5952d1c7d0b 100644
--- a/core/builtins/src/kotlin/Ranges.kt
+++ b/core/builtins/src/kotlin/Ranges.kt
@@ -29,7 +29,7 @@ public class ByteRange(start: Byte, endInclusive: Byte) : ByteProgression(start,
     override val start: Byte get() = first
     override val endInclusive: Byte get() = last
 
-    override fun contains(item: Byte): Boolean = start <= item && item <= endInclusive
+    override fun contains(value: Byte): Boolean = start <= value && value <= endInclusive
 
     override fun isEmpty(): Boolean = start > endInclusive
 
@@ -58,7 +58,7 @@ public class CharRange(start: Char, endInclusive: Char) : CharProgression(start,
     override val start: Char get() = first
     override val endInclusive: Char get() = last
 
-    override fun contains(item: Char): Boolean = start <= item && item <= endInclusive
+    override fun contains(value: Char): Boolean = start <= value && value <= endInclusive
 
     override fun isEmpty(): Boolean = start > endInclusive
 
@@ -88,7 +88,7 @@ public class ShortRange(start: Short, endInclusive: Short) : ShortProgression(st
     override val start: Short get() = first
     override val endInclusive: Short get() = last
 
-    override fun contains(item: Short): Boolean = start <= item && item <= endInclusive
+    override fun contains(value: Short): Boolean = start <= value && value <= endInclusive
 
     override fun isEmpty(): Boolean = start > endInclusive
 
@@ -117,7 +117,7 @@ public class IntRange(start: Int, endInclusive: Int) : IntProgression(start, end
     override val start: Int get() = first
     override val endInclusive: Int get() = last
 
-    override fun contains(item: Int): Boolean = start <= item && item <= endInclusive
+    override fun contains(value: Int): Boolean = start <= value && value <= endInclusive
 
     override fun isEmpty(): Boolean = start > endInclusive
 
@@ -146,7 +146,7 @@ public class LongRange(start: Long, endInclusive: Long) : LongProgression(start,
     override val start: Long get() = first
     override val endInclusive: Long get() = last
 
-    override fun contains(item: Long): Boolean = start <= item && item <= endInclusive
+    override fun contains(value: Long): Boolean = start <= value && value <= endInclusive
 
     override fun isEmpty(): Boolean = start > endInclusive
 
diff --git a/generators/src/org/jetbrains/kotlin/generators/builtins/ranges.kt b/generators/src/org/jetbrains/kotlin/generators/builtins/ranges.kt
index 98ca64abfb0..84edb42f5a4 100644
--- a/generators/src/org/jetbrains/kotlin/generators/builtins/ranges.kt
+++ b/generators/src/org/jetbrains/kotlin/generators/builtins/ranges.kt
@@ -83,7 +83,7 @@ public class $range(start: $t, endInclusive: $t) : ${t}Progression(start, endInc
     override val endInclusive: $t get() = last
 """ else "") +
 """
-    override fun contains(item: $t): Boolean = start <= item && item <= endInclusive
+    override fun contains(value: $t): Boolean = start <= value && value <= endInclusive
 
     override fun isEmpty(): Boolean = start > endInclusive