#1090076: explain the behavior of *vars* in get() better.
diff --git a/Lib/configparser.py b/Lib/configparser.py
index 7ad24d8..6e38f26 100644
--- a/Lib/configparser.py
+++ b/Lib/configparser.py
@@ -661,11 +661,12 @@
def get(self, section, option, raw=False, vars=None):
"""Get an option value for a given section.
- All % interpolations are expanded in the return values, based on the
- defaults passed into the constructor, unless the optional argument
- `raw' is true. Additional substitutions may be provided using the
- `vars' argument, which must be a dictionary whose contents overrides
- any pre-existing defaults.
+ If `vars' is provided, it must be a dictionary. The option is looked up
+ in `vars' (if provided), `section', and in `defaults' in that order.
+
+ All % interpolations are expanded in the return values, unless the
+ optional argument `raw' is true. Values for interpolation keys are
+ looked up in the same manner as the option.
The section DEFAULT is special.
"""