Add documentation for install_command option.

1 files changed, 16 insertions, 0 deletions

diff --git a/doc/config.txt b/doc/config.txt
index 0cfef42..92a89f4 100644
--- a/doc/config.txt
+++ b/doc/config.txt
@@ -76,6 +76,22 @@ Complete list of settings that you can put into ``testenv*`` sections:
     For eventually performing a call to ``subprocess.Popen(args, ...)``
     ``args`` are determined by splitting the whole command by whitespace.
 
+.. confval:: install_command=ARGV
+
+    .. versionadded:: 1.6
+
+    the command to be used for installing packages into the virtual
+    environment; both the sdist for the package under test and any
+    defined dependencies. Must contain the substitution key
+    ``{packages}`` which will be replaced by the packages to
+    install. May also contain the substitution key ``{opts}``, which
+    will be replaced by the ``-i`` option to specify index server
+    (according to :confval:`indexserver` and the ``:indexserver:dep``
+    syntax of :confval:`deps`) and the ``--download-cache`` option, if
+    you've specified :confval:`downloadcache` and your
+    :confval:`install_command` begins with ``pip``.  **default**: ``pip
+    install {opts} {packages}``
+
 .. confval:: whitelist_externals=MULTI-LINE-LIST
 
     each line specifies a command name (in glob-style pattern format)