diff --git a/mpi/docs/06-user-defined-communicators.md b/mpi/docs/06-user-defined-communicators.md
index a5ccdbc12..17c5f4788 100644
--- a/mpi/docs/06-user-defined-communicators.md
+++ b/mpi/docs/06-user-defined-communicators.md
@@ -61,10 +61,10 @@ if (rank%2 == 0) {
 MPI_Comm_split(MPI_COMM_WORLD, color,
     rank, &subcomm);
 
-MPI_Comm_rank(subcomm, &mysubid);
+MPI_Comm_rank(subcomm, &subrank);
 
 printf ("I am rank %d in MPI_COMM_WORLD, but"
-    "%d in Comm %d.\n", rank, mysubid,
+    "%d in Comm %d.\n", rank, subrank,
     color);
 ```
 
@@ -100,7 +100,7 @@ if (rank%2 == 0) {
 }
 MPI_Comm_split(MPI_COMM_WORLD, color,
                rank, &subcomm);
-MPI_Comm_rank(subcomm, &mysubid);
+MPI_Comm_rank(subcomm, &subrank);
 MPI_Bcast(sendbuf, 8, MPI_INT, 0,
           subcomm);
 ```
diff --git a/mpi/docs/09-user-defined-datatypes.md b/mpi/docs/09-user-defined-datatypes.md
index 2fe3d56ac..faab6de9e 100644
--- a/mpi/docs/09-user-defined-datatypes.md
+++ b/mpi/docs/09-user-defined-datatypes.md
@@ -179,7 +179,7 @@ call mpi_type_free(rowtype, ierr)
 </div>
 <div class=column>
 ```c
-if (myid == 0)
+if (rank == 0)
   MPI_Type_vector(n, 1, 2, MPI_FLOAT,
                   &newtype)
   ...
@@ -190,7 +190,7 @@ else
 ```
 
 ```c
-if (myid == 0)
+if (rank == 0)
   MPI_Send(A, n, MPI_FLOAT, 1, ...)
 else
   MPI_Type_vector(n, 1, 2, MPI_FLOAT,
@@ -550,5 +550,3 @@ MPI_Type_free(&sub_type);
 <div class=column>
 ![](img/type_array.png){.center width=100%}
 </div>
-
-