Specify when the range is empty in KDoc

libraries/stdlib/unsigned/src/kotlin/UIntRange.kt

@@ -22,6 +22,11 @@ public class UIntRange(start: UInt, endInclusive: UInt) : UIntProgression(start,
 
     override fun contains(value: UInt): Boolean = first <= value && value <= last
 
+    /** 
+     * Checks if the range is empty.
+     
+     * The range is empty if its start value is greater than the end value.
+     */
     override fun isEmpty(): Boolean = first > last
 
     override fun equals(other: Any?): Boolean =
@@ -72,7 +77,12 @@ internal constructor(
 
     override fun iterator(): UIntIterator = UIntProgressionIterator(first, last, step)
 
-    /** Checks if the progression is empty. */
+    /** 
+     * Checks if the progression is empty.
+     
+     * Progression with a positive step is empty if its first element is greater than the last element.
+     * Progression with a negative step is empty if its first element is less than the last element.
+     */
     public open fun isEmpty(): Boolean = if (step > 0) first > last else first < last
 
     override fun equals(other: Any?): Boolean =

libraries/stdlib/unsigned/src/kotlin/ULongRange.kt

@@ -22,6 +22,11 @@ public class ULongRange(start: ULong, endInclusive: ULong) : ULongProgression(st
 
     override fun contains(value: ULong): Boolean = first <= value && value <= last
 
+    /** 
+     * Checks if the range is empty.
+     
+     * The range is empty if its start value is greater than the end value.
+     */
     override fun isEmpty(): Boolean = first > last
 
     override fun equals(other: Any?): Boolean =
@@ -72,7 +77,12 @@ internal constructor(
 
     override fun iterator(): ULongIterator = ULongProgressionIterator(first, last, step)
 
-    /** Checks if the progression is empty. */
+    /** 
+     * Checks if the progression is empty.
+     
+     * Progression with a positive step is empty if its first element is greater than the last element.
+     * Progression with a negative step is empty if its first element is less than the last element.
+     */
     public open fun isEmpty(): Boolean = if (step > 0) first > last else first < last
 
     override fun equals(other: Any?): Boolean =