diff --git a/README.md b/README.md
index 61d0182..4252197 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,14 @@ https://gitlab.irap.omp.eu/CDPP/SPACEWEATHERONLINE
 
 ## Install
 
+### Prerequisites
+gcc
+libncurses-dev
+python2
+virtualenv
+
+### Python venv
+
 ``` bash
 virtualenv venv
 source venv/bin/activate
@@ -66,9 +74,9 @@ Configure Apache to use `web/run_ssa.wsgi` and use pip2.7 install system wide.
 ### Install libcdf.
 
 ``` bash
-wget https://spdf.sci.gsfc.nasa.gov/pub/software/cdf/dist/cdf37_0/linux/cdf37_0-dist-all.tar.gz
-tar -xzvf cdf37_0-dist-all.tar.gz
-cd cdf37_0-dist
+wget https://spdf.gsfc.nasa.gov/pub/software/cdf/dist/cdf38_1/cdf38_1-dist-all.tar.gz
+tar -xzvf cdf38_1-dist-all.tar.gz
+cd cdf38_1-dist
 make all OS=linux ENV=gnu
 make INSTALLDIR=/usr/local/lib/libcdf install
 ```
@@ -97,4 +105,4 @@ Try with the `--no-cache-dir` option.
 ```
 sudo setfacl  -R -m u:apache:rwx -m u:`whoami`:rwx cache
 sudo setfacl -dR -m u:apache:rwx -m u:`whoami`:rwx cache
-```
\ No newline at end of file
+```
--
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