diff --git a/fcts/quatnormalize.m b/fcts/quatnormalize.m
new file mode 100644
index 0000000..4902da9
--- /dev/null
+++ b/fcts/quatnormalize.m
@@ -0,0 +1,6 @@
+function [ qnorm ] = quatnormalize ( q )
+% normalize of a quaternion
+m = norm(q)
+qnorm = q / m;
+end
+