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-rw-r--r--docs/using_as_module.txt5
1 files changed, 3 insertions, 2 deletions
diff --git a/docs/using_as_module.txt b/docs/using_as_module.txt
index f50a0ec..662affd 100644
--- a/docs/using_as_module.txt
+++ b/docs/using_as_module.txt
@@ -167,10 +167,11 @@ the following required options:
* `input` (required): The source text file.
- `input` may be set to one of two options:
+ `input` may be set to one of three options:
* a string which contains a path to a readable file on the file system,
- * or a readable file-like object.
+ * a readable file-like object,
+ * or `None` (default) which will read from `stdin`.
* `output`: The target which output to written to.