diff --git a/hw/ip/prim/util/secded_gen.py b/hw/ip/prim/util/secded_gen.py
index a86f709..f934216 100755
--- a/hw/ip/prim/util/secded_gen.py
+++ b/hw/ip/prim/util/secded_gen.py
@@ -222,11 +222,11 @@
 
     ## Find code matrix =======================================================
     # This is main part to find the parity matrix.
-    # For example, find SECDED for 4bit message is to find 3x4 matrix as below
-    # | 1 0 0 0 x x x |
-    # | 0 1 0 0 x x x |
-    # | 0 0 1 0 x x x |
-    # | 0 0 0 1 x x x |
+    # For example, find SECDED for 4bit message is to find 4x4 matrix as below
+    # | 1 0 0 0 x x x x |
+    # | 0 1 0 0 x x x x |
+    # | 0 0 1 0 x x x x |
+    # | 0 0 0 1 x x x x |
     # Then message _k_ X matrix_code ==> original message with parity
     #
     # Make a row to have even number of 1 including the I matrix.