* admin/notes/hydra: Mention environment variable EMACS_HYDRA_CI.

diff --git a/admin/notes/hydra b/admin/notes/hydra
index d5959354b0809c917391078e6ad6a275ffb01441..2cd4dbcb96611657a8693ed7e5dae083bea60d57 100644 (file)
--- a/admin/notes/hydra
+++ b/admin/notes/hydra
@@ -8,6 +8,7 @@ NOTES FOR EMACS CONTINUOUS BUILD ON HYDRA
 A continuous build for Emacs can be found at
 http://hydra.nixos.org/jobset/gnu/emacs-trunk
 http://hydra.nixos.org/jobset/gnu/emacs-24
+http://hydra.nixos.org/jobset/gnu/emacs-25
 
 * It builds Emacs on various platforms.
 Sometimes jobs fail due to hydra problems rather than Emacs problems.
@@ -43,6 +44,11 @@ http://git.savannah.gnu.org/cgit/hydra-recipes.git/tree/emacs
 To modify the build job, email the patch to hydra-users@gnu.org.  The
 build recipes are written in the Nix language.
 
+* Identifying hydra
+Lisp packages, Makefiles, scripts, and other software could determine
+whether they run on hydra by checking for the environment variable
+EMACS_HYDRA_CI.
+
 * Other Information
 For a list of other GNU packages that have a continuous build on
 Hydra, see http://hydra.nixos.org/project/gnu