diff --git a/changelog.d/453.misc b/changelog.d/453.misc
index c3ee3c32..22ba14ba 100644
--- a/changelog.d/453.misc
+++ b/changelog.d/453.misc
@@ -1 +1 @@
-Include Sydent's version number when reporting to Sentry.
\ No newline at end of file
+Include Sydent's version number (and git commit hash if available) when reporting to Sentry.
diff --git a/changelog.d/454.misc b/changelog.d/454.misc
new file mode 100644
index 00000000..8375cd05
--- /dev/null
+++ b/changelog.d/454.misc
@@ -0,0 +1 @@
+Include Sydent's version number (and git commit hash if available) when reporting to Sentry.
\ No newline at end of file
diff --git a/sydent/util/versionstring.py b/sydent/util/versionstring.py
index a4885a0d..8a4d2981 100644
--- a/sydent/util/versionstring.py
+++ b/sydent/util/versionstring.py
@@ -10,6 +10,15 @@
 def get_version_string() -> str:
     """Calculate a git-aware version string for sydent.
 
+    The version string is `sydent@x.y.z`, where `x.y.z` comes from
+    `sydent.__version__`. If the `sydent` module belongs to a git repository on
+    disk, we the current branch, tag and commit hash, plus a flag to indicate
+    if the working tree is dirty.
+
+    An example probably illustrates best. Testing locally, I get
+    `sydent@2.4.6 (b=dmr/version-in-sentry,05e1fa8,dirty)`.
+    If this wasn't done from within the repository, I'd just get `sydent@2.4.6`.
+
     Implementation nicked from Synapse.
     """
     version_string = sydent.__version__