diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
index 9b0aeb9609..64e4083f82 100644
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -732,7 +732,7 @@ class localrepository(object):
                 iterrevs = list(bheadrevs)
 
             # This loop prunes out two kinds of heads - heads that are
-            # superceded by a head in newheadrevs, and newheadrevs that are not
+            # superseded by a head in newheadrevs, and newheadrevs that are not
             # heads because an existing head is their descendant.
             while iterrevs:
                 latest = iterrevs.pop()
diff --git a/mercurial/tags.py b/mercurial/tags.py
index e4e0129fe1..c5633e2685 100644
--- a/mercurial/tags.py
+++ b/mercurial/tags.py
@@ -124,8 +124,8 @@ def _updatetags(filetags, tagtype, alltags, tagtypes):
             continue
 
         # we prefer alltags[name] if:
-        #  it supercedes us OR
-        #  mutual supercedes and it has a higher rank
+        #  it supersedes us OR
+        #  mutual supersedes and it has a higher rank
         # otherwise we win because we're tip-most
         anode, ahist = nodehist
         bnode, bhist = alltags[name]