diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b8ffe08
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+node_modules/
+package-lock.json
+
diff --git a/parse.js b/parse.js
index c760811..69f53d0 100755
--- a/parse.js
+++ b/parse.js
@@ -1,12 +1,18 @@
 #!/usr/bin/env node
 // Usage: node parse.js
+//
 // Script that creates index.html out of web/template.html and README.md.
 // It is written in JS because this code used to be executed on the client side.
-// To install dependencies run:
-// $ npm install -g jsdom jquery showdown highlightjs
-// If running on Mac and modules can't be found after installation add:
+// To install the Node.js and npm run:
+// $ sudo apt install nodejs npm  # On macOS use `brew install ...` instead.
+// To install dependencies globally, run:
+// $ npm install -g jsdom jquery showdown highlightjs@9.12.0
+// If running on macOS and modules can't be found after installation add:
 // export NODE_PATH=/usr/local/lib/node_modules
 // to the ~/.bash_profile or ~/.bashrc file and run '$ bash'.
+// To avoid problems with permissions and path variables, install modules
+// into project's directory using:
+// $ npm install jsdom jquery showdown highlightjs@9.12.0
 
 
 const fs = require('fs');