diff --git a/application/utils.inc.php b/application/utils.inc.php
index f822de8f9..98a09758f 100644
--- a/application/utils.inc.php
+++ b/application/utils.inc.php
@@ -2127,6 +2127,12 @@ class utils
 	 *     or an empty string if no such module is found (or not called within a module file)
 	 *
 	 * @uses \debug_backtrace()
+	 *
+	 * @since 3.0.0 Before writing model.*.php file, compiler will now always delete it.
+	 *      If you have symlinks enabled, base dir will be original module dir, but since this behavior change this won't be true anymore for model.*.php
+	 *      In consequence the backtrace analysis won't be possible for this file
+	 *      See N°4854
+	 * @link https://www.itophub.io/wiki/page?id=3_0_0%3Arelease%3A3_0_whats_new#compiler_always_generate_new_model_php compiler behavior change documentation
 	 */
 	public static function GetCurrentModuleDir($iCallDepth)
 	{
diff --git a/setup/compiler.class.inc.php b/setup/compiler.class.inc.php
index 572fd5fad..89b1e5088 100644
--- a/setup/compiler.class.inc.php
+++ b/setup/compiler.class.inc.php
@@ -3542,12 +3542,22 @@ EOF;
 
 	/**
 	 * Write a file only if not exists
-	 * Also add some informations in case of a write failleure
-	 * @param $sFilename
-	 * @param $sContent
+	 * Also add some informations when write failure occurs
+	 *
+	 * @param string $sFilename
+	 * @param string $sContent
+	 * @param int $flags
 	 *
 	 * @return bool|int
 	 * @throws \Exception
+	 *
+	 * @uses \unlink()
+	 * @uses \file_put_contents()
+	 *
+	 * @since 3.0.0 The file is removed before writing (commit c5d265f6)
+	 *      For now this causes model.*.php files to always be located in env-* dir, even if symlinks are enabled
+	 *      See N°4854
+	 * @link https://www.itophub.io/wiki/page?id=3_0_0%3Arelease%3A3_0_whats_new#compiler_always_generate_new_model_php compiler behavior change documentation
 	 */
 	protected function WriteFile($sFilename, $sContent, $flags = null)
 	{