diff --git a/Doc/api.tex b/Doc/api.tex
index 96d2d76..780034a 100644
--- a/Doc/api.tex
+++ b/Doc/api.tex
@@ -1368,7 +1368,7 @@
 \end{cfuncdesc}
 
 
-\section{Sequence protocol}
+\section{Sequence Protocol}
 
 \begin{cfuncdesc}{int}{PySequence_Check}{PyObject *o}
 Return 1 if the object provides sequence protocol, and 0
@@ -1452,7 +1452,7 @@
 expression: \code{o.index(value)}.
 \end{cfuncdesc}
 
-\section{Mapping protocol}
+\section{Mapping Protocol}
 
 \begin{cfuncdesc}{int}{PyMapping_Check}{PyObject *o}
 Return 1 if the object provides mapping protocol, and 0
diff --git a/Doc/api/api.tex b/Doc/api/api.tex
index 96d2d76..780034a 100644
--- a/Doc/api/api.tex
+++ b/Doc/api/api.tex
@@ -1368,7 +1368,7 @@
 \end{cfuncdesc}
 
 
-\section{Sequence protocol}
+\section{Sequence Protocol}
 
 \begin{cfuncdesc}{int}{PySequence_Check}{PyObject *o}
 Return 1 if the object provides sequence protocol, and 0
@@ -1452,7 +1452,7 @@
 expression: \code{o.index(value)}.
 \end{cfuncdesc}
 
-\section{Mapping protocol}
+\section{Mapping Protocol}
 
 \begin{cfuncdesc}{int}{PyMapping_Check}{PyObject *o}
 Return 1 if the object provides mapping protocol, and 0