It's a bit odd that the primary documentation is in notmuch-config,
but it is consistent with the "query:" prefix.
+**index.header.<prefix>** **[STORED IN DATABASE]**
+ Define the query prefix <prefix>, based on a mail header. For
+ example ``index.header.List=List-Id`` will add a probabilistic
+ prefix ``List:`` that searches the ``List-Id`` field. User
+ defined prefixes must not start with 'a'...'z'; in particular
+ adding a prefix with same name as a predefined prefix is not
+ supported. See **notmuch-search-terms(7)** for a list of existing
+ prefixes, and an explanation of probabilistic prefixes.
+
**built_with.<name>**
Compile time feature <name>. Current possibilities include
"compact" (see **notmuch-compact(1)**) and "field_processor" (see
**built_with.<name>**
Compile time feature <name>. Current possibilities include
"compact" (see **notmuch-compact(1)**) and "field_processor" (see
can be present on a given message with several different values.
See **notmuch-properties(7)** for more details.
can be present on a given message with several different values.
See **notmuch-properties(7)** for more details.
+User defined prefixes are also supported, see **notmuch-config(1)** for
+details.
+