diff --git a/README.md b/README.md
index 4a0584b..3777b4a 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,11 @@ Extractor of the calendar of the IT degree of university Paris 8.
 
 ## Build and run
 You will need Rust installed to compile the program.
+<details><summary>You also need `OpenSSL` installed.</summary>
+
+- Ubuntu: `sudo apt install libssl-dev`
+- Fedora: `dnf install openssl-devel`
+</details>
 
 1. Clone the repo and get in
 ```bash