diff --git a/README.md b/README.md
index baaf459..1670873 100644
--- a/README.md
+++ b/README.md
@@ -109,5 +109,13 @@ Status s = add_inplace(A, B);  // modify A itself
 or overloading?
 ```
 
+```text
+Scalar, Vector and Matrix; All in one file or?
+Matrix C = mul(A, B);          // allocate/return result
+Status s = mul_into(A, B, C);  // write into existing matrix
+Status s = add_inplace(A, B);  // modify A itself
+or overloading?
+```
+