diff --git a/primitiveCollections/src/main/java/org/lucares/collections/IntList.java b/primitiveCollections/src/main/java/org/lucares/collections/IntList.java
index 8be762c..e695f5c 100644
--- a/primitiveCollections/src/main/java/org/lucares/collections/IntList.java
+++ b/primitiveCollections/src/main/java/org/lucares/collections/IntList.java
@@ -541,10 +541,13 @@ public final class IntList implements Serializable, Cloneable {
 	/**
 	 * Returns the index of the first occurrence of {@code value}, or -1 if it does
 	 * not exist.
+	 * <p>
+	 * This method uses a binary search algorithm if the list is sorted.
 	 *
 	 * @param value
 	 *            the value
 	 * @return the index, or -1
+	 * @see #isSorted()
 	 */
 	public int indexOf(final int value) {
 		return indexOf(value, 0);
@@ -553,6 +556,8 @@ public final class IntList implements Serializable, Cloneable {
 	/**
 	 * Returns the index of the first occurrence of {@code value} starting at the
 	 * {@code offset}'s element, or -1 if it does not exist.
+	 * <p>
+	 * This method uses a binary search algorithm if the list is sorted.
 	 *
 	 * @param value
 	 *            the value
@@ -561,6 +566,7 @@ public final class IntList implements Serializable, Cloneable {
 	 * @return the index, or -1
 	 * @throws ArrayIndexOutOfBoundsException
 	 *             if offset is negative, or larger than the size of the list
+	 * @see #isSorted()
 	 */
 	public int indexOf(final int value, final int offset) {