diff --git a/PE_CBL_graphics.py b/PE_CBL_graphics.py
index 2a600d36e2509202d84397603064ef6676e37405..30486f9790ebee289ac3c9ee6bce5b906c9288ed 100644
--- a/PE_CBL_graphics.py
+++ b/PE_CBL_graphics.py
@@ -126,7 +126,7 @@ def plot_CBL_assimilation(exp,figtitle,which_cycle=0,ax=None):
 
         ensplot(ax,b,0,nz,zt,colors = ['red','salmon'],label='prior')
         ensplot(ax,a,0,nz,zt,colors = ['royalblue','lightskyblue'],label='posterior')
-        ax.scatter(o,ocoords,marker="o",s=20,color=naturerun_color,zorder=10)
+        ax.scatter(o,ocoords,marker="o",s=20,color=naturerun_color,zorder=10,label='observations')
         #ax.set_title(r'$\theta$ (K), posterior')
         return ax