diff --git a/README2.md b/README2.md
index 2f1e02b..f756ee8 100644
--- a/README2.md
+++ b/README2.md
@@ -1,13 +1,19 @@
 Just some notes
 ---------------
 
-To build, one should use the following:
+Once you have built the entire mozilla-unified with all the mach bootstrap stuff (which will
+install the needed binaries in $HOME/.mozbuild), don't forget to copy the entire
+C:\Program Files\Git folder to /c/mozilla-source to get a sed.exe that understands the -z option,
+and to get sha256sum.exe.
+
+
+To build, one should use the following command in the checked out windows repo:
 
 $ time bash build.sh fetch prepare build package
 
 
 the final .zip is in:
-  C:\mozilla-source\firefox-85.0\obj-x86_64-pc-mingw32\dist
+  C:\mozilla-source\windows\firefox-85.0\obj-x86_64-pc-mingw32\dist
 
 
 * problem with old sed. does not recognize -z. using the one from Git might be a work around.