diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -2651,6 +2651,13 @@
             ui.write(_(b"%s not renamed\n") % rel)
 
 
+@command(b'debugrequires|debugrequirements', [], b'')
+def debugrequirements(ui, repo):
+    """ print the current repo requirements """
+    for r in sorted(repo.requirements):
+        ui.write(b"%s\n" % r)
+
+
 @command(
     b'debugrevlog',
     cmdutil.debugrevlogopts + [(b'd', b'dump', False, _(b'dump index data'))],
diff --git a/tests/test-completion.t b/tests/test-completion.t
--- a/tests/test-completion.t
+++ b/tests/test-completion.t
@@ -121,6 +121,7 @@
   debugrebuilddirstate
   debugrebuildfncache
   debugrename
+  debugrequires
   debugrevlog
   debugrevlogindex
   debugrevspec
@@ -306,6 +307,7 @@
   debugrebuilddirstate: rev, minimal
   debugrebuildfncache: 
   debugrename: rev
+  debugrequires: 
   debugrevlog: changelog, manifest, dir, dump
   debugrevlogindex: changelog, manifest, dir, format
   debugrevspec: optimize, show-revs, show-set, show-stage, no-optimized, verify-optimized
diff --git a/tests/test-help.t b/tests/test-help.t
--- a/tests/test-help.t
+++ b/tests/test-help.t
@@ -1051,6 +1051,8 @@
    debugrebuildfncache
                  rebuild the fncache file
    debugrename   dump rename information
+   debugrequires
+                 print the current repo requirements
    debugrevlog   show data and statistics about a revlog
    debugrevlogindex
                  dump the contents of a revlog index
diff --git a/tests/test-requires.t b/tests/test-requires.t
--- a/tests/test-requires.t
+++ b/tests/test-requires.t
@@ -48,6 +48,14 @@
   > # enable extension locally
   > supportlocally = $TESTTMP/supported-locally/supportlocally.py
   > EOF
+  $ hg -R supported debugrequirements
+  dotencode
+  featuresetup-test
+  fncache
+  generaldelta
+  revlogv1
+  sparserevlog
+  store
   $ hg -R supported status
 
   $ hg init push-dst