diff --git a/libraries/base/common/tb/vhdl/tb_common_complex_mult.vhd b/libraries/base/common/tb/vhdl/tb_common_complex_mult.vhd
index c3dd86ab5ad1f170b2347c8b7ca2e027a4c8d126..c81f6e8b3851b982e62aff14f543cf4008cde119 100644
--- a/libraries/base/common/tb/vhdl/tb_common_complex_mult.vhd
+++ b/libraries/base/common/tb/vhdl/tb_common_complex_mult.vhd
@@ -18,6 +18,13 @@
 -- along with this program.  If not, see <http://www.gnu.org/licenses/>.
 --
 -------------------------------------------------------------------------------
+-- Purpose: Verify different architectures of common_complex_mult
+-- Description:
+--   p_verify verifies that the instances of common_complex_mult all yield the
+--   expected results and ASSERTs an ERROR in case they differ.
+-- Usage:
+-- > as 10
+-- > run -all  -- signal tb_end will stop the simulation by stopping the clk
 
 LIBRARY IEEE;
 USE IEEE.std_logic_1164.ALL;