diff -r 28ba7d111337 -r d63c5c651183 hgext/uncommit.py
--- a/hgext/uncommit.py	Wed Mar 14 11:16:49 2018 -0700
+++ b/hgext/uncommit.py	Sat Mar 17 09:49:21 2018 -0700
@@ -151,6 +151,9 @@
     files to their uncommitted state. This means that files modified or
     deleted in the changeset will be left unchanged, and so will remain
     modified in the working directory.
+
+    If no files are specified, the commit will be pruned, unless --keep is
+    given.
     """
     opts = pycompat.byteskwargs(opts)