diff --git a/panda/src/doc/howto.install_panda_on_windows.cyg-1.3.2 b/panda/src/doc/howto.install_panda_on_windows.cyg-1.3.2
index 10b69ad283..b630954a2a 100644
--- a/panda/src/doc/howto.install_panda_on_windows.cyg-1.3.2
+++ b/panda/src/doc/howto.install_panda_on_windows.cyg-1.3.2
@@ -66,7 +66,9 @@ Step 2: Install MS Platform SDK to get updated VC libs and headers
 Step 3: Install Cygwin (v1.3.3)
   - Install Cygwin by running V:\cygwin-1.3.3\setup.exe, and selecting 
     'install from local directory' (or go to cygwin.com and run setup.exe
-     from the link there to install the latest version from the internet)
+     from the link there to install the latest version from the internet).
+     Be careful to make sure that packages such as CVS, perl, bison,
+     etc. which are required to build PANDA are selected for installation.
   - Open up a shell by running (and, if you desire, creating a shortcut to)
     tcsh.exe in: 
        C:/Cygwin/bin