"boolean" --> "Boolean" (per the style guide).
diff --git a/Doc/lib/libparser.tex b/Doc/lib/libparser.tex
index 9ff3f42..15b46ae 100644
--- a/Doc/lib/libparser.tex
+++ b/Doc/lib/libparser.tex
@@ -473,7 +473,7 @@
can safely require that the tree be in tuple form rather than list
form, allowing a simple variable representation to be
\code{['variable_name']}. A simple recursive function can implement
-the pattern matching, returning a boolean and a dictionary of variable
+the pattern matching, returning a Boolean and a dictionary of variable
name to value mappings. (See file \file{example.py}.)
\begin{verbatim}