Typo fix.
diff --git a/Doc/lib/libunittest.tex b/Doc/lib/libunittest.tex
index 350abae..f1e1033 100644
--- a/Doc/lib/libunittest.tex
+++ b/Doc/lib/libunittest.tex
@@ -540,7 +540,7 @@
 
 \begin{funcdesc}{main}{\optional{module\optional{,
                  defaultTest\optional{, argv\optional{,
-                 testRunner\optional{, testRunner}}}}}}
+                 testRunner\optional{, testLoader}}}}}}
   A command-line program that runs a set of tests; this is primarily
   for making test modules conveniently executable.  The simplest use
   for this function is to include the following line at the end of a