diff -r 5d839e1f0ce9 -r 9b68a2083dac hgext3rd/topic/__init__.py
--- a/hgext3rd/topic/__init__.py	Sun Jul 02 13:48:45 2017 +0200
+++ b/hgext3rd/topic/__init__.py	Sun Jul 02 13:49:32 2017 +0200
@@ -340,7 +340,6 @@
 
 def _changetopics(ui, repo, revset, newtopic):
     rewrote = 0
-    needevolve = False
     wl = l = txn = None
     try:
         wl = repo.wlock()
@@ -392,7 +391,6 @@
             newnode = repo.commitctx(mc)
             successors[c.node()] = newnode
             ui.debug('new node id is %s\n' % node.hex(newnode))
-            needevolve = needevolve or (len(c.children()) > 0)
             obsolete.createmarkers(repo, [(c, (repo[newnode],))])
             rewrote += 1
         # move the working copy too
@@ -407,9 +405,6 @@
         lock.release(txn, l, wl)
         repo.invalidate()
     ui.status('changed topic on %d changes\n' % rewrote)
-    if needevolve:
-        evolvetarget = 'topic(%s)' % newtopic if newtopic else 'not topic()'
-        ui.status('please run hg evolve --rev "%s" now\n' % evolvetarget)
 
 def _listtopics(ui, repo, opts):
     fm = ui.formatter('topics', opts)