Adding notes to the inspector?

Just download this new free tool from the asset store. link: https://www.assetstore.unity3d.com/en/#!/content/51884

**strong text**Look this example: link: http://forum.unity3d.com/threads/add-info-text-notes-into-the-inspector.265330/

Make a C# script name InfoTextNote.

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 public class InfoTextNote : MonoBehaviour
 {
     public bool isReady = true;
     public string TextInfo = "Text here... " + "/n Lock when finish.";
 
     public void SwitchToggle ()
     {
         isReady = !isReady;
     }
 
     void Start ()
     {
         this.enabled = false; // Disable the component when the game start
     }
 }

Then make a folder and name it "Editor". In it make a new C# name AddInspectorText

 using UnityEngine;
 using System.Collections;    
 using UnityEditor;
 
 /* *Made by AlanMattano }} 2014* */
 
 [CustomEditor(typeof(InfoTextNote))]
 public class AddInspectorText : Editor {
 
 private int c = 0;
     private string buttonText = "Start Writting";
     private int MaxSizeInt = 5;
     private int[] IntArray = new int[] { 0, 1, 2, 3, 4 };
     private string[] MaxSizeString = new string[] { "Line Label", "Box Text ", "Box Info", "Box Warning", "Box Error" };
 
     
     public override void OnInspectorGUI()
     {
         InfoTextNote inMyScript = (InfoTextNote)target;    //
 
         if ( inMyScript.TextInfo == "Start writting text here... " +
             "/n Press Lock when finish." ) 
             ShowLogMessage() ;// se podria agregar alguna funcin en especial
 
         if ( !inMyScript.isReady ) {
             // The user is writing the text in this inspector editor.
 
             //DrawDefaultInspector();    // Unity function: add all is in the inspector
 
             switch (MaxSizeInt)
             {
             case 0:
                 if (EditorGUILayout.Toggle(inMyScript.isReady))inMyScript.SwitchToggle();                                    // Toggle
                 EditorGUILayout.LabelField(inMyScript.TextInfo);        // This is a small line text
                 break;
             case 1:
                 if ( GUILayout.Button(buttonText)) inMyScript.SwitchToggle();            // Button
                 EditorGUILayout.HelpBox(inMyScript.TextInfo, MessageType.None);            // This is a small box
                 break;
             case 2:
                 if ( GUILayout.Button(buttonText)) inMyScript.SwitchToggle();            // Button
                 EditorGUILayout.HelpBox(inMyScript.TextInfo, MessageType.Info);            // This is a help box
                 break;
             case 3:
                 if ( GUILayout.Button(buttonText)) inMyScript.SwitchToggle();            // Button
                 EditorGUILayout.HelpBox(inMyScript.TextInfo, MessageType.Warning);            // This is a Warning box
                 break;
             case 4:
                 if ( GUILayout.Button(buttonText)) inMyScript.SwitchToggle();            // Button
                 EditorGUILayout.HelpBox(inMyScript.TextInfo, MessageType.Error);            // This is a Error box
                 break;
             default:
                 if ( GUILayout.Button(buttonText)) inMyScript.SwitchToggle();            // Button
                 EditorGUILayout.HelpBox(inMyScript.TextInfo, MessageType.Info);            // This is a help box
                 break;
             }
         }else{
             // The user is writing the text in this inspector editor
 
             //DrawDefaultInspector();// for debug
 
             buttonText = "Lock !";
             // Button
             if ( GUILayout.Button(buttonText)) inMyScript.SwitchToggle();
 
 
             // Text
             inMyScript.TextInfo = EditorGUILayout.TextArea (inMyScript.TextInfo);
 
 
             // selection
             MaxSizeInt = EditorGUILayout.IntPopup("Text Type :", MaxSizeInt, MaxSizeString, IntArray);
 
             // warning
             EditorGUILayout.HelpBox( " Press LOCK at the top when finish. ", MessageType.Warning);            // This is a Warning box
         }
     }
 
     void ShowLogMessage() {
         c++;
         if (c==1) {
 
             Debug.Log (" Need to add text " + "\n");
         }
     }
 }

Then return to InfoTextNote and add it into the inspector.

Others in the community edit this answer. You can add corrections and improve this script

I realize this is an old question but I was recently looking for a solution to this problem and didn't like the the suggested solutions, so I wrote my own simple PropertyDrawer and PropertyAttribute. Get more information at the forum post:

https://forum.unity3d.com/threads/helpattribute-allows-you-to-use-helpbox-in-the-unity-inspector-window.462768/

Hope this helps someone out who is still looking for a solution :)