diff --git a/preliminaries/motifs-and-structral-roles_lecture.md b/preliminaries/motifs-and-structral-roles_lecture.md
index fa2c73d..38f2be6 100755
--- a/preliminaries/motifs-and-structral-roles_lecture.md
+++ b/preliminaries/motifs-and-structral-roles_lecture.md
@@ -6,7 +6,7 @@ In this section, we will begin by introducing the defination of subgraphs. Subne
 
 For example, in Figure 1 we show all the non-isomorphic directed subgraphs of size 3. These subgraphs differ from each other in the number of edges or direction of edges. 
 
-![test](assets/img/Exact_Subgraph_Enumeration.png)
+![binom-dist](../assets/img/binom_dist_graph.png?style=centerme)
 
 ### Motifs