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-rw-r--r--specs/spf-2.0/metadata.mdwn9
1 files changed, 8 insertions, 1 deletions
diff --git a/specs/spf-2.0/metadata.mdwn b/specs/spf-2.0/metadata.mdwn
index 74fdefe..36f4326 100644
--- a/specs/spf-2.0/metadata.mdwn
+++ b/specs/spf-2.0/metadata.mdwn
@@ -129,7 +129,14 @@ Source Package Version Identifier [src-ver]
In general, the syntax of source package version identifiers is:
- <pkgver>[+sip<siprev>][-<pkgrev>][+<dist>~<distrev>][~bpu<distnum>+<bpurev>]
+ [<epoch>:]<pkgver>[+sip<siprev>][-<pkgrev>][+<dist>~<distrev>][~bpu<distnum>+<bpurev>]
+
+`<epoch>` should almost always be omitted, in which case it is effectively zero.
+It may be used when the upstream version numbering scheme changes or when one or
+more binary packages are migrated to a different source package with a different
+upstream version numbering scheme. It must be a string of one or more digits,
+the first of which must be greater than or equal to `1`. (A regular expression
+for this is `[1-9][0-9]*`.)
`<pkgver>` is the version of the original upstream package or the native
package. It may only consist of lowercase Latin letters, digits, periods,