diff --git a/nvm.sh b/nvm.sh
index 05a0bd1..5ad3578 100755
--- a/nvm.sh
+++ b/nvm.sh
@@ -1347,6 +1347,8 @@ nvm() {
         return 8
       fi
 
+      # This nvm_ensure_version_installed call can be a performance bottleneck
+      # on shell startup. Perhaps we can optimize it away or make it faster.
       nvm_ensure_version_installed "$PROVIDED_VERSION"
       EXIT_CODE=$?
       if [ "$EXIT_CODE" != "0" ]; then