diff --git a/doc/arkdep.8 b/doc/arkdep.8
index 624b481..b953e1a 100644
--- a/doc/arkdep.8
+++ b/doc/arkdep.8
@@ -23,7 +23,7 @@ Check for and report any config issues or untracked deployments.
 .SS get-available
 Get and print available variants in repo.
 .SS diff
-Generate and print diff between two deployments.
+Generate and print diff between current deployment and an image from the repos.
 .SS remove
 Remove specified deployments.
 .SH ENVIRONMENT