Document imgtool release process
Signed-off-by: Fabio Utzig <utzig@apache.org>
diff --git a/docs/release.md b/docs/release.md
index 65d83f2..328531c 100644
--- a/docs/release.md
+++ b/docs/release.md
@@ -32,6 +32,19 @@
that should be merged into master are those to fix bugs found in the
rc and Mynewt metadata as described in the next section.
+## imgtool release
+
+imgtool is released through pypi.org (The Python package index) and
+requires that its version to be updated by editing
+`scripts/imgtool/__init__.py` and modifying the exported version:
+
+`imgtool_version = "X.Y.ZrcN"`
+
+where `rcX`, `aX` and `bX` are accepted pre-release versions (just
+numbers for final releases). For more info see:
+
+https://www.python.org/dev/peps/pep-0440/#pre-releases
+
## Mynewt release information
On Mynewt, `newt` always fetches a versioned MCUBoot release, so after