diff --git a/include/cglm/affine-mat.h b/include/cglm/affine-mat.h
index 1cd4973..c22c0e0 100644
--- a/include/cglm/affine-mat.h
+++ b/include/cglm/affine-mat.h
@@ -8,6 +8,7 @@
 /*
  Functions:
    CGLM_INLINE void glm_mul(mat4 m1, mat4 m2, mat4 dest);
+   CGLM_INLINE void glm_mul_rot(mat4 m1, mat4 m2, mat4 dest);
    CGLM_INLINE void glm_inv_tr(mat4 mat);
  */