diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -873,6 +873,8 @@ def showconfig(ui, repo, *values, **opts
     for each config item.
     """
 
+    for f in util.rcpath():
+        ui.debug(_('read config from: %s\n') % f)
     untrusted = bool(opts.get('untrusted'))
     if values:
         if len([v for v in values if '.' in v]) > 1:
diff --git a/tests/test-hgrc.out b/tests/test-hgrc.out
--- a/tests/test-hgrc.out
+++ b/tests/test-hgrc.out
@@ -11,6 +11,7 @@ foo.bar=a\nb\nc\nde\nfg
 foo.baz=bif cb
 hg: config error at $HGRCPATH:1: cannot include /no-such-file (No such file or directory)
 % customized hgrc
+read config from: .../.hgrc
 .../.hgrc:13: alias.log=log -g
 .../.hgrc:11: defaults.identify=-n
 .../.hgrc:2: ui.debug=true
@@ -22,6 +23,7 @@ hg: config error at $HGRCPATH:1: cannot 
 .../.hgrc:8: ui.style=~/.hgstyle
 .../.hgrc:9: ui.logtemplate={node}
 % plain hgrc
+read config from: .../.hgrc
 none: ui.traceback=True
 none: ui.verbose=False
 none: ui.debug=True