diff --git a/package.json b/package.json
index 8a9f5aa..65dd6fe 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "hash",
     "random number generator",
     "hash function",
-    "webgl",
+    "webgl2",
     "glslify",
     "math"
   ],
diff --git a/readme.md b/readme.md
index 390424f..e243e3c 100644
--- a/readme.md
+++ b/readme.md
@@ -36,3 +36,8 @@ vec3 r3 = prng(seed.xyz);
 // Return four random numbers
 vec4 r4 = prng(seed.xyzw);
 ```
+
+## Demo
+
+* https://github.com/riccardoscalco/glsl-pcg-example
+* https://observablehq.com/@riccardoscalco/pcg-random-number-generators-in-glsl.
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