diff --git a/Problem 5/my_acceleration.m b/Problem 5/my_acceleration.m
index d420c08..3337e19 100644
--- a/Problem 5/my_acceleration.m	
+++ b/Problem 5/my_acceleration.m	
@@ -22,5 +22,6 @@ function [ax,ay,az]=my_acceleration(x,y,z,t)
     ax = diff_match_dims(vx',t);
     ay = diff_match_dims(vy',t);
     az = diff_match_dims(vz',t);
+    %added apostrophe for derivatives of velocity
 
 end
diff --git a/README.md b/README.md
index 6443746..7b57bf4 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 # Answer to Homework Question
 I hope to learn how to perform MATLAB functions more easily.
 
-#Problem 3
+#Problem 3 (Mean_Std)
 ```MATLAB
 A_66=zeros(6:6);
 for i=1:6;
@@ -18,7 +18,7 @@ mean of A_66 = 12.25
 
 stdev of A_66 = 9.07
 
-#Problem 4
+#Problem 4 (Energy Use)
 ```MATLAB
 data=dlmread('US_energy_by_sector.csv',',',2,0);
 h=figure();
@@ -54,7 +54,7 @@ saveas(h,'figure_02.png')
 ```
 ![Cumulative US Energy Use per Year from 1949-2016](./Problem 4/figure_02.png)
 
-#Problem freefall
+#Problem 5 (Freefall)
 
 ```MATLAB
 g=figure();
@@ -78,4 +78,4 @@ saveas(g,'figure01.png')
 
 ![Velocity Comparison by Varying Time Steps](./Problem 3/figure01.png)
 
-#Problem 5 (Velocity and Acceleration)
+#Problem 6 (Velocity and Acceleration)