diff --git a/docs/installation.md b/docs/installation.md
index 73e791c56..a23399441 100644
--- a/docs/installation.md
+++ b/docs/installation.md
@@ -245,6 +245,19 @@ open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10
 
 If this file is inexistent, then you're probably on a different version of MacOS, so you may need to consult the internet for specific resolution details.
 
+### MacOS installation error with python 3.9
+
+When using python 3.9 on macOS, it's currently necessary to install some os-level modules to allow dependencies to compile.
+The errors you'll see happen during installation and are related to the installation of `tables` or `blosc`.
+
+You can install the necessary libraries with the following command:
+
+``` bash
+brew install hdf5 c-blosc
+```
+
+After this, please run the installation (script) again.
+
 -----
 
 Now you have an environment ready, the next step is