diff --git a/Exercise 1/exercise1.py b/Exercise 1/exercise1.py
index be3f3ba..274230a 100644
--- a/Exercise 1/exercise1.py	
+++ b/Exercise 1/exercise1.py	
@@ -54,6 +54,8 @@ def part1(radFactor, orbits):
     ax.plot(results.y[0],results.y[1]) # Make the plot
     ax.plot(0,0)
     ax.legend(['Moon'])                # and add a key.
+    ax.axhline(y=0, color='k', linewidth=0.5)
+    ax.axvline(x=0, color='k', linewidth=0.5)
     plt.show()