diff --git a/platform/util/src/com/intellij/util/text/CharArrayUtil.java b/platform/util/src/com/intellij/util/text/CharArrayUtil.java
index 5396650ebcd0..8ab04ee87055 100644
--- a/platform/util/src/com/intellij/util/text/CharArrayUtil.java
+++ b/platform/util/src/com/intellij/util/text/CharArrayUtil.java
@@ -352,21 +352,11 @@ public class CharArrayUtil {
 
   /**
    * Tries to find index of given pattern at the given buffer.
-   * <p/>
-   * <b>Note:</b> given <code>'toIndex'</code> value restricts examination to <code>'toIndex -1'</code> value (exclusive).. I.e. invocation like below
-   * doesn't find the match:
-   * <pre>
-   *        String buffer = "aab";
-   *        String pattern = "ab";
-   *        CharArrayUtil.indexOf(buffer, pattern, 0, buffer.length()); // right boundary is "aab".length() - 1 = 2 (exclusive)
-   * </pre>
-   * <p/>
-   * This is historical behavior and is not going to be changed in order to preserve backward compatibility.
    *
    * @param buffer       characters buffer which contents should be checked for the given pattern
    * @param pattern      target characters sequence to find at the given buffer
    * @param fromIndex    start index (inclusive). Zero is used if given index is negative
-   * @param toIndex      defines end index (exclusive) by the formula <code>'toIndex - 1'</code>
+   * @param toIndex      end index (exclusive)
    * @return             index of the given pattern at the given buffer if the match is found; <code>-1</code> otherwise
    */
   public static int indexOf(@NotNull CharSequence buffer, @NotNull CharSequence pattern, int fromIndex, final int toIndex) {