Fix dropped word.
diff --git a/Doc/ext.tex b/Doc/ext.tex
index b32702e..d168aa6 100644
--- a/Doc/ext.tex
+++ b/Doc/ext.tex
@@ -879,7 +879,7 @@
hand, if a program calls \code{free()} for a block and then continues
to use the block, it creates a conflict with re-use of the block
through another \code{malloc()} call. This is called \dfn{using freed
-memory} has the same bad consequences as referencing uninitialized
+memory}. It has the same bad consequences as referencing uninitialized
data --- core dumps, wrong results, mysterious crashes.
Common causes of memory leaks are unusual paths through the code. For