diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index f5ee4d10f2..b1c5538cfb 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -16,6 +16,10 @@
    The license applies to all entries newer than 2009-04-28.
 */
 
+2012-10-24 13:53 UTC+0200 Viktor Szakats (harbour syenar.net)
+  * INSTALL
+    + documented HB_INSTALL_3RDDYN envvar.
+
 2012-10-24 13:47 UTC+0200 Viktor Szakats (harbour syenar.net)
   - doc/en/license.txt
     - deleted yet another copy of the Harbour license.
diff --git a/harbour/INSTALL b/harbour/INSTALL
index 8f2b0b7e5b..81ba6014c1 100644
--- a/harbour/INSTALL
+++ b/harbour/INSTALL
@@ -756,6 +756,9 @@ HARBOUR
                                  We test only the official/mainstream ones. Also
                                  note that the generated implibs will require .dlls
                                  compatible with the ones used at build time.)
+   - HB_INSTALL_3RDDYN=yes       Copy dynamic libraries of external .dll dependencies
+                                 to the dynamic library directory in 'install' build
+                                 phase. Default: no
    - HB_SRC_ROOTPATH=<dir>       When using GNU Make older than 3.81, you shall set
                                  the root directory of Harbour source tree as an
                                  absolute path. If not set, some build functionality