diff --git a/tutorials/mpi-reduce-and-allreduce/code/reduce_avg.c b/tutorials/mpi-reduce-and-allreduce/code/reduce_avg.c
index c60247f..57999f6 100644
--- a/tutorials/mpi-reduce-and-allreduce/code/reduce_avg.c
+++ b/tutorials/mpi-reduce-and-allreduce/code/reduce_avg.c
@@ -26,7 +26,7 @@ float *create_rand_nums(int num_elements) {
 
 int main(int argc, char** argv) {
   if (argc != 2) {
-    fprintf(stderr, "Usage: avg num_elements_per_proc\n");
+    fprintf(stderr, "Usage: reduce_avg num_elements_per_proc\n");
     exit(1);
   }
 
diff --git a/tutorials/mpi-reduce-and-allreduce/code/reduce_stddev.c b/tutorials/mpi-reduce-and-allreduce/code/reduce_stddev.c
index 4560d37..7ea9558 100644
--- a/tutorials/mpi-reduce-and-allreduce/code/reduce_stddev.c
+++ b/tutorials/mpi-reduce-and-allreduce/code/reduce_stddev.c
@@ -26,7 +26,7 @@ float *create_rand_nums(int num_elements) {
 
 int main(int argc, char** argv) {
   if (argc != 2) {
-    fprintf(stderr, "Usage: avg num_elements_per_proc\n");
+    fprintf(stderr, "Usage: reduce_stddev num_elements_per_proc\n");
     exit(1);
   }
 
diff --git a/tutorials/mpi-scatter-gather-and-allgather/code/all_avg.c b/tutorials/mpi-scatter-gather-and-allgather/code/all_avg.c
index c7bea7d..693bdb8 100644
--- a/tutorials/mpi-scatter-gather-and-allgather/code/all_avg.c
+++ b/tutorials/mpi-scatter-gather-and-allgather/code/all_avg.c
@@ -36,7 +36,7 @@ float compute_avg(float *array, int num_elements) {
 
 int main(int argc, char** argv) {
   if (argc != 2) {
-    fprintf(stderr, "Usage: avg num_elements_per_proc\n");
+    fprintf(stderr, "Usage: all_avg num_elements_per_proc\n");
     exit(1);
   }