diff --git a/pkgs/development/r-modules/default.nix b/pkgs/development/r-modules/default.nix
index b8014fcc517d..7c528ea20329 100644
--- a/pkgs/development/r-modules/default.nix
+++ b/pkgs/development/r-modules/default.nix
@@ -703,7 +703,7 @@ let
       mbedtls
       nng
     ];
-    ncdf4 = [ pkgs.netcdf ];
+    ncdf4 = [ pkgs.netcdf ]; # for nc-config
     neojags = [ pkgs.jags ];
     nloptr = [ pkgs.pkg-config ];
     odbc = [ pkgs.pkg-config ];