diff --git a/src/lib/pubkey/frodokem/frodo_matrix.cpp b/src/lib/pubkey/frodokem/frodo_matrix.cpp
index de67d8b73e3..67bb1da6244 100644
--- a/src/lib/pubkey/frodokem/frodo_matrix.cpp
+++ b/src/lib/pubkey/frodokem/frodo_matrix.cpp
@@ -123,7 +123,7 @@ FrodoMatrix FrodoMatrix::mul_add_as_plus_e(const FrodoKEMConstants& constants,
                                            const FrodoMatrix& e,
                                            StrongSpan<const FrodoSeedA> seed_a) {
    // Generate-and-multiply: generate matrix A (N x N) row-wise, multiply by s on the right.
-   // Inputs: s^T, e (N x N_BAR), seed for matrix A
+   // Inputs: s^T (N_BAR x N), e (N x N_BAR), seed for matrix A
    // Output: The elements of the FrodoMatrix will correspond to A*s + e (N x N_BAR).
 
    BOTAN_ASSERT(std::get<0>(e.dimensions()) == std::get<1>(s.dimensions()) &&