U/README: Grammatical correction

diff --git a/U/README b/U/README
index e9feb87..c8033f4 100644 (file)
--- a/U/README
+++ b/U/README
@@ -99,7 +99,7 @@ modified/
 nullified/
     These are null units that replace units in the standard
     distribution.  Typically they are there because some part of the
-    perl source accidentally uses a symbol that metaconfig means we
+    perl source accidentally uses a symbol that metaconfig thinks means we
     want the corresponding unit.
 
 perl/