diff --git a/Changelog.md b/Changelog.md
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,10 @@
+### 0.5.4.2
+
+- *nhm-tool*: use cradle *bios* in generated *hie.yaml*. The bios shell script
+  returns an error message with advice to run *make env* if GHC environment
+  file (technically, a symbolic link to this file) is missing. It also loads
+  extra source files automatically if they follow the GHC naming convention.
+
 ### 0.5.4.1
 
 - *nhm-tool*: add a new target *make config* in generated *Makefile*: this
diff --git a/NgxExport/Distribution.hs b/NgxExport/Distribution.hs
--- a/NgxExport/Distribution.hs
+++ b/NgxExport/Distribution.hs
@@ -312,15 +312,15 @@
 --
 -- > $ make env
 --
--- This is enough to start editing the Haskell source file in an editor which
--- has support for the /Haskell Language Server/.
+-- This is enough to start editing the Haskell source file in an editor with
+-- support for the /Haskell Language Server/.
 --
--- If you want to add more Haskell source files, add their names into variable
--- /SRC/ in /Makefile/. If the root Haskell source file depends on modules from
--- other source files, add their names (or module names) into the list of
--- arguments in file /hie.yaml/. This is required for the Haskell Language
--- Server to work correctly. Note also that in this case the names of the files
--- must be equal to the names of the modules these files provide.
+-- If you want to add more Haskell source files, follow the naming convention
+-- described in the /GHC User's Guide/ in section
+-- [The search path](https://ghc.gitlab.haskell.org/ghc/doc/users_guide/separate_compilation.html#search-path).
+-- In this case, no changes in /hie.yaml/ are required. But it makes sense to
+-- add the new source files into variable /SRC/ in /Makefile/ to let /make/
+-- track them too.
 
 -- $drawbacks
 --
diff --git a/ngx-export-distribution.cabal b/ngx-export-distribution.cabal
--- a/ngx-export-distribution.cabal
+++ b/ngx-export-distribution.cabal
@@ -1,5 +1,5 @@
 name:                       ngx-export-distribution
-version:                    0.5.4.1
+version:                    0.5.4.2
 synopsis:                   Build custom libraries for Nginx Haskell module
 description:                Build custom libraries for
         <https://github.com/lyokha/nginx-haskell-module Nginx Haskell module>.
diff --git a/nhm-tool.hs b/nhm-tool.hs
--- a/nhm-tool.hs
+++ b/nhm-tool.hs
@@ -521,6 +521,7 @@
      \CABAL := cabal\n\
      \GHCVER := $(shell $(GHC) --numeric-version)\n\
      \GHCENV := .ghc.environment.$(MACHINE)-$(KERNEL)-$(GHCVER)\n\
+     \GHCENVLNK := ", ghcEnvLnk, "\n\
      \DEPLIBS := $(MACHINE)-$(KERNEL)-ghc-$(GHCVER)\n\
      \BUILDDIR := dist-nhm\n\
      \SETUPCONFIG := $(BUILDDIR)/setup-config\n\
@@ -529,19 +530,21 @@
      \\n\
      \all: $(DISTR)\n\
      \\n\
-     \env: $(GHCENV)\n\
+     \env: $(GHCENVLNK)\n\
      \\n\
      \config: $(SETUPCONFIG)\n\
      \\n\
-     \$(GHCENV): cabal.project $(PKGNAME).cabal\n\
+     \$(GHCENVLNK): cabal.project $(PKGNAME).cabal\n\
+     \\trm -f $(GHCENVLNK)\n\
      \\t$(CABAL) install --builddir=\"$(BUILDDIR)\" --lib --only-dependencies \
      \\\\n\
      \\t  --package-env .\n\
      \\tsed -i 's/\\(^package-id \\)/--\\1/' $(GHCENV)\n",
      updatePath,
      "\t$(NHMTOOL) deps $(PKGNAME) -d \"$(BUILDDIR)\" >> $(GHCENV)\n\
+     \\tln -sf $(GHCENV) $(GHCENVLNK)\n\
      \\n\
-     \$(SETUPCONFIG): $(GHCENV)\n",
+     \$(SETUPCONFIG): $(GHCENVLNK)\n",
      updatePath,
      "\trunhaskell --ghc-arg=-package=base \\\n\
      \\t  --ghc-arg=-package=$(PKGDISTR) Setup.hs configure \\\n\
@@ -572,7 +575,7 @@
      \\n\
      \clean-all: clean\n\
      \\trm -rf $(BUILDDIR)\n\
-     \\trm -f $(GHCENV) $(DISTR)\n"
+     \\trm -f $(GHCENV) $(GHCENVLNK) $(DISTR)\n"
     ]
     where updatePath =
               "\tif test \"$(NHMTOOL)\" = nhm-tool && ! command -v nhm-tool \
@@ -596,8 +599,29 @@
 hieYaml :: InitData -> Text
 hieYaml InitData {..} = T.concat
     ["cradle:\n\
-     \  direct:\n\
-     \    arguments: ["
-    ,T.pack $ intercalate ", " $ map show initDataGhcOptions, "]\n"
+     \  bios:\n\
+     \    shell: |\n\
+     \      if [ -L ", ghcEnvLnk, " ]\n\
+     \      then\n\
+     \          echo -e \""
+    ,T.replace "-" "\\x2d" $ T.pack $ intercalate "\\n" initDataGhcOptions
+    ,"\" > $HIE_BIOS_OUTPUT\n\
+     \          for file in $(find * -name '[A-Z]*.hs')\n\
+     \          do\n\
+     \              if grep -q \"^\\s*module $(echo $file |\n\
+     \                  sed 's/^\\(.*\\)\\..*/\\1/;s/\\//./g')\" $file\n\
+     \              then\n\
+     \                  echo $file >> $HIE_BIOS_OUTPUT\n\
+     \              fi\n\
+     \          done\n\
+     \      else\n\
+     \          echo -n \"Ghc environment file wasn't found, \"`\n\
+     \                 `\"run \\\"make env\\\" and restart \
+     \language server.\" >&2\n\
+     \          exit 1\n\
+     \      fi\n"
     ]
+
+ghcEnvLnk :: Text
+ghcEnvLnk = ".ghc.environment.lnk"