diff --git a/mercurial/commands.py b/mercurial/commands.py
index 3de40566f1..bf88ea25a8 100644
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -547,6 +547,8 @@ def bisect(ui, repo, rev=None, extra=None, command=None,
 
           hg log --graph -r "bisect(range)"
 
+      See :hg:`help revsets` for more about the `bisect()` keyword.
+
     Returns 0 on success.
     """
     def extendbisectrange(nodes, good):
diff --git a/mercurial/hbisect.py b/mercurial/hbisect.py
index c59ea6a7c9..68996cf146 100644
--- a/mercurial/hbisect.py
+++ b/mercurial/hbisect.py
@@ -162,6 +162,7 @@ def get(repo, status):
     - ``range``              : all csets taking part in the bisection
     - ``pruned``             : csets that are good, bad or skipped
     - ``untested``           : csets whose fate is yet unknown
+    - ``ignored``            : csets ignored due to DAG topology
     """
     state = load_state(repo)
     if status in ('good', 'bad', 'skip'):
@@ -191,12 +192,22 @@ def get(repo, status):
         # 'untested' is all cset that are- in 'range', but not in 'pruned'
         untested = '( (%s) - (%s) )' % (range, pruned)
 
+        # 'ignored' is all csets that were not used during the bisection
+        # due to DAG topology, but may however have had an impact.
+        # Eg., a branch merged between bads and goods, but whose branch-
+        # point is out-side of the range.
+        iba = '::bisect(bad) - ::bisect(good)'  # Ignored bads' ancestors
+        iga = '::bisect(good) - ::bisect(bad)'  # Ignored goods' ancestors
+        ignored = '( ( (%s) | (%s) ) - (%s) )' % (iba, iga, range)
+
         if status == 'range':
             return [c.rev() for c in repo.set(range)]
         elif status == 'pruned':
             return [c.rev() for c in repo.set(pruned)]
         elif status == 'untested':
             return [c.rev() for c in repo.set(untested)]
+        elif status == 'ignored':
+            return [c.rev() for c in repo.set(ignored)]
 
         else:
             raise error.ParseError(_('invalid bisect state'))
diff --git a/mercurial/revset.py b/mercurial/revset.py
index 42d9455377..4376246e92 100644
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -243,6 +243,7 @@ def bisect(repo, subset, x):
     - ``range``      : all csets taking part in the bisection
     - ``pruned``     : csets that are good, bad or skipped
     - ``untested``   : csets whose fate is yet unknown
+    - ``ignored``    : csets ignored due to DAG topology
     """
     status = getstring(x, _("bisect requires a string")).lower()
     return [r for r in subset if r in hbisect.get(repo, status)]
diff --git a/tests/test-bisect2.t b/tests/test-bisect2.t
index 23a88ad276..af19d62b61 100644
--- a/tests/test-bisect2.t
+++ b/tests/test-bisect2.t
@@ -270,6 +270,7 @@ complex bisect test 1  # first bad rev is 9
   13:b0a32c86eb31
   15:857b178a7cf3
   16:609d82a7ebae
+  $ hg log -q -r 'bisect(ignored)'
   $ hg bisect -g      # -> update to rev 13
   Testing changeset 13:b0a32c86eb31 (9 changesets remaining, ~3 tests)
   3 files updated, 0 files merged, 1 files removed, 0 files unresolved
@@ -422,6 +423,7 @@ first bad rev is 15
   $ hg bisect -s      # -> update to rev 15
   Testing changeset 15:857b178a7cf3 (5 changesets remaining, ~2 tests)
   3 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg log -q -r 'bisect(ignored)'
   $ hg bisect -b
   Due to skipped revisions, the first bad revision could be any of:
   changeset:   9:3c77083deb4a
@@ -463,6 +465,7 @@ first bad rev is 15
   13:b0a32c86eb31
   15:857b178a7cf3
   16:609d82a7ebae
+  $ hg log -q -r 'bisect(ignored)'
 
 complex bisect test 4
 
@@ -560,6 +563,14 @@ end at merge: 17 bad, 11 good (but 9 is first bad)
   $ hg bisect -g 11
   Testing changeset 13:b0a32c86eb31 (5 changesets remaining, ~2 tests)
   3 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ hg log -q -r 'bisect(ignored)'
+  2:051e12f87bf1
+  3:0950834f0a9c
+  4:5c668c22234f
+  5:385a529b6670
+  6:a214d5d3811a
+  9:3c77083deb4a
+  10:429fcd26f52d
   $ hg bisect -g
   Testing changeset 15:857b178a7cf3 (3 changesets remaining, ~1 tests)
   3 files updated, 0 files merged, 0 files removed, 0 files unresolved
@@ -590,16 +601,38 @@ end at merge: 17 bad, 11 good (but 9 is first bad)
   16:609d82a7ebae
   17:228c06deef46
   $ hg log -q -r 'bisect(untested)'
+  $ hg log -q -r 'bisect(ignored)'
+  2:051e12f87bf1
+  3:0950834f0a9c
+  4:5c668c22234f
+  5:385a529b6670
+  6:a214d5d3811a
+  9:3c77083deb4a
+  10:429fcd26f52d
   $ hg bisect --extend
   Extending search to changeset 8:dab8161ac8fc
   2 files updated, 0 files merged, 2 files removed, 0 files unresolved
   $ hg log -q -r 'bisect(untested)'
+  $ hg log -q -r 'bisect(ignored)'
+  2:051e12f87bf1
+  3:0950834f0a9c
+  4:5c668c22234f
+  5:385a529b6670
+  6:a214d5d3811a
+  9:3c77083deb4a
+  10:429fcd26f52d
   $ hg bisect -g # dab8161ac8fc
   Testing changeset 9:3c77083deb4a (3 changesets remaining, ~1 tests)
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg log -q -r 'bisect(untested)'
   9:3c77083deb4a
   10:429fcd26f52d
+  $ hg log -q -r 'bisect(ignored)'
+  2:051e12f87bf1
+  3:0950834f0a9c
+  4:5c668c22234f
+  5:385a529b6670
+  6:a214d5d3811a
   $ hg bisect -b
   The first bad revision is:
   changeset:   9:3c77083deb4a
@@ -628,6 +661,12 @@ end at merge: 17 bad, 11 good (but 9 is first bad)
   16:609d82a7ebae
   17:228c06deef46
   $ hg log -q -r 'bisect(untested)'
+  $ hg log -q -r 'bisect(ignored)'
+  2:051e12f87bf1
+  3:0950834f0a9c
+  4:5c668c22234f
+  5:385a529b6670
+  6:a214d5d3811a
 
 user adds irrelevant but consistent information (here: -g 2) to bisect state