diff --git a/lua/lspconfig/configs/pylyzer.lua b/lua/lspconfig/configs/pylyzer.lua
index 34a4914b4c..d5e163af09 100644
--- a/lua/lspconfig/configs/pylyzer.lua
+++ b/lua/lspconfig/configs/pylyzer.lua
@@ -23,12 +23,22 @@ return {
         checkOnType = false,
       },
     },
+    on_new_config = function(new_config, _)
+      new_config.cmd_env.ERG_PATH = vim.fn.getenv('HOME') .. '/.erg'
+    end,
   },
   docs = {
     description = [[
   https://github.com/mtshiba/pylyzer
 
   `pylyzer`, a fast static code analyzer & language server for Python.
+
+  `pylyzer` requires Erg as dependency, and finds it via `ERG_PATH` environment variable.
+  In the default config `ERG_PATH` is set to `~/.erg`, as shown in the `on_new_config` function.
+  Add a `on_new_config` on your own if you want to change it.
+
+  To install Erg, simply extract tarball/zip from [Erg releases](https://github.com/erg-lang/erg/releases/latest)
+  to the the path where you want to install it, e.g. `~/.erg`.
     ]],
   },
 }