diff --git a/ChangeLog b/ChangeLog
index 26a8fad97..262763f85 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2004-09-04  Pavel S. Shirshov  <pavelsh@mail.ru>
+
+	* HACKING: Add to section "Programming Tips" g_free tip.
+
 2004-09-02  Roland Illig  <roland.illig@gmx.de>
 
 	* HACKING: Added a section "Programming Tips" which lists mistakes
diff --git a/HACKING b/HACKING
index 50085cbd1..a2d31da85 100644
--- a/HACKING
+++ b/HACKING
@@ -296,3 +296,9 @@ size_t: This data type is suitable for expressing sizes of memory or the
 
 strncpy: Don't use this function in newly created code. It is slow, insecure
 	and hard to use. A much better alternative is g_strlcpy (see there).
+
+g_free: g_free handles NULL argument too, no need for the comparison.
+	Bad way:
+	    if (old_dir) g_free (old_dir);
+	Right way:
+	    g_free (old_dir);