typical TCL docu nonsens

typical TCL "package" horror
# I know  finally the "autopath" is the WRONG name
lappend autopath /some/path/to/package/dir
package require FileLib
 >>
can't find package FileLib      while executing
"package require FileLib"
----
→ go into the directory
sbin> cat pkgIndex.tcl
package ifneeded FileLib 2.0 [list source [file join $dir FileLib.tcl]]
package ifneeded StdLib 2.0 [list source [file join $dir StdLib.tcl]]
----
→ try to debug, add "set tcl_traceExec 1"
→ get a lot of "nonsens" (important info cut away)
Calling proc "::unknown" "::tcl::tm::Unkn..." "::tclPkgUnknown" "FileLib" "0-"
Calling proc "auto_load" "::tcl::tm::Unkn..." "::"
Calling proc "auto_qualify" "::tcl::tm::Unkn..." "::"
Calling proc "auto_load_index"
Calling proc "::tcl::tm::Defa..."
Calling proc "roots" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "add" "/home/dev1usr/e..."
Calling proc "::tcl::tm::Unkn..." "::tclPkgUnknown" "FileLib" "0-"
Calling proc "::unknown" "::tclPkgUnknown" "FileLib" "0-"
Calling proc "auto_load" "::tclPkgUnknown" "::"
Calling proc "auto_qualify" "::tclPkgUnknown" "::"
Calling proc "::tclPkgUnknown" "FileLib" "0-"
Calling lambda "apply" "{dir} {\n    se..." "/home/dev1usr/e..."
can't find package FileLib
     while executing
"package require FileLib"
---
call: man n package
→ check for the term "path" → not found in manpage
→ a lot of text but NOT a single word how to setup the path to get the package found !!
----
after some research the right name is "auto_path"
mfg ao