diff --git a/doc/html/ksquirrel-libs-olibs2.html b/doc/html/ksquirrel-libs-olibs2.html
index 710df8a..80c6b7a 100644
--- a/doc/html/ksquirrel-libs-olibs2.html
+++ b/doc/html/ksquirrel-libs-olibs2.html
@@ -1143,7 +1143,7 @@ WIDTH="100%"
 COLOR="#000000"
 ><PRE
 CLASS="programlisting"
->#include "polygon.hpp"
+>#include "polygon.h"
 #include &#60;iostream&#62;
 #include &#60;dlfcn.h&#62;
 
@@ -1185,7 +1185,7 @@ int main() {
 ></TR
 ></TABLE
 ><P
->polygon.hpp:</P
+>polygon.h:</P
 ><TABLE
 BORDER="0"
 BGCOLOR="#E0E0E0"
@@ -1236,7 +1236,7 @@ WIDTH="100%"
 COLOR="#000000"
 ><PRE
 CLASS="programlisting"
->#include "polygon.hpp"
+>#include "polygon.h"
 #include &#60;cmath&#62;
 
 class triangle : public polygon {
diff --git a/doc/sources/Makefile.am b/doc/sources/Makefile.am
index dc0e0e7..ad4be01 100644
--- a/doc/sources/Makefile.am
+++ b/doc/sources/Makefile.am
@@ -11,7 +11,7 @@ install-data-local:
 	$(INSTALL_SCRIPT)  c++/compile              $(DESTDIR)$(datadir)/doc/ksquirrel-libs/$(PACKAGE_VERSION)/sources/c++/compile
 	$(INSTALL_DATA)    c++/main.cpp             $(DESTDIR)$(datadir)/doc/ksquirrel-libs/$(PACKAGE_VERSION)/sources/c++/main.cpp
 	$(INSTALL_DATA)    c++/triangle.cpp         $(DESTDIR)$(datadir)/doc/ksquirrel-libs/$(PACKAGE_VERSION)/sources/c++/triangle.cpp
-	$(INSTALL_DATA)    c++/polygon.hpp          $(DESTDIR)$(datadir)/doc/ksquirrel-libs/$(PACKAGE_VERSION)/sources/c++/polygon.hpp
+	$(INSTALL_DATA)    c++/polygon.h            $(DESTDIR)$(datadir)/doc/ksquirrel-libs/$(PACKAGE_VERSION)/sources/c++/polygon.h
 	$(INSTALL_DATA)    c++/README               $(DESTDIR)$(datadir)/doc/ksquirrel-libs/$(PACKAGE_VERSION)/sources/c++/README
 	
 	$(INSTALL_DATA)    ttx/Makefile.am          $(DESTDIR)$(datadir)/doc/ksquirrel-libs/$(PACKAGE_VERSION)/sources/ttx/Makefile.am
@@ -21,4 +21,4 @@ install-data-local:
 	$(INSTALL_DATA)    ttx/fmt_codec_ttx.h      $(DESTDIR)$(datadir)/doc/ksquirrel-libs/$(PACKAGE_VERSION)/sources/ttx/fmt_codec_ttx.h
 	$(INSTALL_DATA)    ttx/fmt_codec_ttx.cpp    $(DESTDIR)$(datadir)/doc/ksquirrel-libs/$(PACKAGE_VERSION)/sources/ttx/fmt_codec_ttx.cpp
 
-EXTRA_DIST = c c++ ttx
\ No newline at end of file
+EXTRA_DIST = c c++ ttx
diff --git a/doc/sources/c++/main.cpp b/doc/sources/c++/main.cpp
index b8fb8cd..eb3b2fe 100644
--- a/doc/sources/c++/main.cpp
+++ b/doc/sources/c++/main.cpp
@@ -1,4 +1,4 @@
-#include "polygon.hpp"
+#include "polygon.h"
 
 #include <iostream>
 #include <dlfcn.h>
diff --git a/doc/sources/c++/polygon.hpp b/doc/sources/c++/polygon.h
similarity index 100%
rename from doc/sources/c++/polygon.hpp
rename to doc/sources/c++/polygon.h
diff --git a/doc/sources/c++/triangle.cpp b/doc/sources/c++/triangle.cpp
index 96185d0..008d679 100644
--- a/doc/sources/c++/triangle.cpp
+++ b/doc/sources/c++/triangle.cpp
@@ -1,4 +1,4 @@
-#include "polygon.hpp"
+#include "polygon.h"
 #include <cmath>
 
 class triangle : public polygon