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-rw-r--r--docs/userguide.rst5
1 files changed, 4 insertions, 1 deletions
diff --git a/docs/userguide.rst b/docs/userguide.rst
index 1a13353..63d13af 100644
--- a/docs/userguide.rst
+++ b/docs/userguide.rst
@@ -40,10 +40,13 @@ In a newly created virtualenv there will also be a :command:`activate` shell
script. For Windows systems, activation scripts are provided for
the Command Prompt and Powershell.
-On Posix systems, this also resides in :file:`/ENV/bin/`, so you can run::
+On Posix systems, this resides in :file:`/ENV/bin/`, so you can run::
$ source bin/activate
+For some shells (e.g. the original Bourne Shell) you may need to use the
+:command:`.` command, when :command:`source` does not exist.
+
This will change your ``$PATH`` so its first entry is the virtualenv's
``bin/`` directory. (You have to use ``source`` because it changes your
shell environment in-place.) This is all it does; it's purely a