From f6f9332bca6e2ead1e818ce53b02f89c0eda7828 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Wed, 24 Oct 2012 18:41:00 -0400
Subject: Document pre-defined substitution variables.

---
diff --git a/specs/spf-2.0/substvars.mdwn b/specs/spf-2.0/substvars.mdwn
index bbe2853..fd4e909 100644
--- a/specs/spf-2.0/substvars.mdwn
+++ b/specs/spf-2.0/substvars.mdwn
@@ -17,3 +17,21 @@ The format for variable substitutions is as follows:
     ${<var-name>}
 
 `<var-name>` is the name of the variable.
+
+
+Special Variables [substvars-defined]
+=====================================
+
+The following substitution variables shall be set:
+
+  * `Source-Version`
+
+    The source 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.
+
+  * `Binary-Version`
+
+    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.
--
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