diff --git a/ctr/images/lr-vs-dnn.jpg b/ctr/images/lr_vs_dnn.jpg
similarity index 100%
rename from ctr/images/lr-vs-dnn.jpg
rename to ctr/images/lr_vs_dnn.jpg
diff --git a/ctr/images/wide-deep.png b/ctr/images/wide_deep.png
similarity index 100%
rename from ctr/images/wide-deep.png
rename to ctr/images/wide_deep.png