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-rw-r--r--specs/spf-2.0/substvars.mdwn11
1 files changed, 11 insertions, 0 deletions
diff --git a/specs/spf-2.0/substvars.mdwn b/specs/spf-2.0/substvars.mdwn
index fd4e909..953375c 100644
--- a/specs/spf-2.0/substvars.mdwn
+++ b/specs/spf-2.0/substvars.mdwn
@@ -35,3 +35,14 @@ The following substitution variables shall be set:
The binary package version, as given in the most recent entry of the change
log. See $[sectlink][src-ver] for the syntax of source package version
identifiers.
+
+
+Defining Substitution Variables [substvars-custom]
+==================================================
+
+Substitution variables may be defined in a file called `substvars`. See
+$[sectlink][control] for the format of this file.
+
+Names must conform to the requirements outlined in $[sectlink][substvars-name].
+Values may be comprised of multiple lines, and empty lines at the beginning and
+end of each substitution variable value shall be removed.