diff --git a/devel/format/stylesheet/prim-internal.en.tm b/devel/format/stylesheet/prim-internal.en.tm
index 816ec99..9c4d006 100644
--- a/devel/format/stylesheet/prim-internal.en.tm
+++ b/devel/format/stylesheet/prim-internal.en.tm
@@ -47,7 +47,7 @@
     <explain-macro|attr|key-1|val-1|<with|mode|math|\<cdots\>>|key-n|val-n><explain-synopsis|XML-like
     attributes>
   <|explain>
-    This tag is included for future compatability with XML. It is used for
+    This tag is included for future compatibility with XML. It is used for
     encoding XML-style attributes by <TeXmacs> trees. For instance, the
     fragment
 
diff --git a/devel/scheme/edit/edit-modify.en.tm b/devel/scheme/edit/edit-modify.en.tm
index be8032f..98458ec 100644
--- a/devel/scheme/edit/edit-modify.en.tm
+++ b/devel/scheme/edit/edit-modify.en.tm
@@ -8,7 +8,7 @@
   The routine <scm|tree-set> and the corresponding macro <scm|tree-set!> can
   be used as a higher level interface to the fundamental routines for
   modifying trees as described in the <hlink|previous
-  section|edit-fundamental.en.tm>. However, the it is still up to the user to
+  section|edit-fundamental.en.tm>. However, it is still up to the user to
   verify that the resulting edit tree is still correct.
 
   <\explain>