diff --git a/.gitignore b/.gitignore
index afa5928..74c9859 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,7 @@ tmp_debug/*
 task.md
 *.pickle
 *.png
+!doc/assets/memory_performance.png
 .DS_Store
 tmp/*
 examples/module/pgo/data/*
diff --git a/doc/memory_performance.png b/doc/assets/memory_performance.png
similarity index 100%
rename from doc/memory_performance.png
rename to doc/assets/memory_performance.png
diff --git a/doc/memory_performance.md b/doc/memory_performance.md
index d8c783c..09a6ffa 100644
--- a/doc/memory_performance.md
+++ b/doc/memory_performance.md
@@ -16,7 +16,7 @@ memory and plots it against problem size.
 
 ## Output Graph
 
-![Peak and average GPU memory vs. number of optimizable parameters, for the three optimizer configurations](memory_performance.png)
+![Peak and average GPU memory vs. number of optimizable parameters, for the three optimizer configurations](assets/memory_performance.png)
 
 *Peak (left) and average (right) GPU memory allocation across the three
 optimizer configurations, plotted against problem size.*