diff --git a/Makefile b/Makefile
index 8d16a252f2..000889bc29 100644
--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ build/ol3.js: $(SRC)
( echo "goog.require('goog.dom');" ; find src/ol -name \*.js | xargs grep -rh ^goog.provide | sort | uniq | sed -e 's/provide/require/g' ) > $@
.PHONY: demos
-demos: demos/api1 demos/side-by-side
+demos: demos/api1 demos/proj4js demos/side-by-side
.PHONY: demos/api1
demos/api1: \
@@ -42,6 +42,18 @@ demos/api1/build.html: demos/api1/index.html.in
demos/api1/debug.html: demos/api1/index.html.in
sed -e 's|@SRC@|http://localhost:9810/compile?id=ol3-api|' $< > $@
+.PHONY: demos/proj4js
+demos/proj4js: \
+ build/ol3-api.js \
+ demos/proj4js/build.html \
+ demos/proj4js/debug.html
+
+demos/proj4js/build.html: demos/proj4js/index.html.in
+ sed -e 's|@SRC@|../../build/ol3-api.js|' $< > $@
+
+demos/proj4js/debug.html: demos/proj4js/index.html.in
+ sed -e 's|@SRC@|http://localhost:9810/compile?id=ol3-api|' $< > $@
+
.PHONY: demos/side-by-side
demos/side-by-side: \
demos/side-by-side/advanced-optimizations.html \
diff --git a/demos/proj4js/index.html.in b/demos/proj4js/index.html.in
new file mode 100644
index 0000000000..5239fee524
--- /dev/null
+++ b/demos/proj4js/index.html.in
@@ -0,0 +1,13 @@
+
+
+
+
+
+ ol3 proj4js demo
+
+
+ ol3 proj4js demo
+
+
+
+
diff --git a/demos/proj4js/proj4js.js b/demos/proj4js/proj4js.js
new file mode 100644
index 0000000000..1325dbb16a
--- /dev/null
+++ b/demos/proj4js/proj4js.js
@@ -0,0 +1,23 @@
+goog.require('goog.dom');
+goog.require('ol.Coordinate');
+goog.require('ol.Projection');
+
+
+var outputElement = document.getElementById('output'), p;
+
+var point, transformedPoint;
+
+point = new ol.Coordinate(-626172.13571216376, 6887893.4928337997);
+transformedPoint = ol.Projection.transformWithCodes(
+ point, 'GOOGLE', 'WGS84');
+outputElement.appendChild(goog.dom.createTextNode(transformedPoint.toString()));
+
+Proj4js.defs['EPSG:21781'] =
+ '+proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 +k_0=1 ' +
+ '+x_0=600000 +y_0=200000 +ellps=bessel ' +
+ '+towgs84=674.374,15.056,405.346,0,0,0,0 +units=m +no_defs';
+
+point = new ol.Coordinate(7.439583333333333, 46.95240555555556);
+transformedPoint = ol.Projection.transformWithCodes(
+ point, 'EPSG:4326', 'EPSG:21781');
+outputElement.appendChild(goog.dom.createTextNode(transformedPoint.toString()));