diff --git a/make-docs.fnl b/make-docs.fnl
index dfefc8e..0a67a95 100644
--- a/make-docs.fnl
+++ b/make-docs.fnl
@@ -29,9 +29,12 @@
             (table.insert fields section)))
         (when header (loop header))))
 
+
+    (fn make-title [name]
+      (.. "<hr><h3><a name=\"pdf-" name "\"><code>" name "</code></a></h3>\n"))
     ;; Artificially insert the `arg` docs.
     ;; This isn't present in the "Basic Functions" part of the manual, but is still useful to be included in the docs.
-    (let [arg-signature "<hr><h3><a name=\"pdf-arg\"><code>arg</code></a></h3>\n"
+    (let [arg-signature (make-title :arg)
           arg-description (-> html
                               ;; The goal here is to extract the smallest string which:
                               ;; 1) contains the string "global table called <code>arg</code>"
@@ -46,6 +49,9 @@
                               (: :match "(.-)>p<\n")
                               (: :reverse))]
       (table.insert fields (.. arg-signature arg-description)))
+    (table.insert fields (.. (make-title "io.stdin") "stdin file"))
+    (table.insert fields (.. (make-title "io.stdout") "stdout file"))
+    (table.insert fields (.. (make-title "io.stderr") "stderr file"))
     (loop (stdlib:find "<hr><h3>.-\n"))
     (values modules fields last-update)))
 
@@ -205,6 +211,9 @@
           (view (list (sym :local) (sym :docs) docs))
           "\n"
           "(set docs._G.fields docs)\n"
+          "(set docs.io.fields.stdin.fields docs.io.fields)\n"
+          "(set docs.io.fields.stdout.fields docs.io.fields)\n"
+          "(set docs.io.fields.stderr.fields docs.io.fields)\n"
           "docs\n"))
       (print (.. "Emitted docs for lua" version)))))
 
diff --git a/src/fennel-ls/docs/lua51.fnl b/src/fennel-ls/docs/lua51.fnl
index a406109..96f1b3d 100644
--- a/src/fennel-ls/docs/lua51.fnl
+++ b/src/fennel-ls/docs/lua51.fnl
@@ -418,6 +418,12 @@ on all platforms."}}
                :read {:binding "io.read"
                       :metadata {:fnl/arglist ["..."]
                                  :fnl/docstring "Equivalent to `io.input():read`."}}
+               :stderr {:binding "io.stderr"
+                        :metadata {:fnl/docstring "stderr file"}}
+               :stdin {:binding "io.stdin"
+                       :metadata {:fnl/docstring "stdin file"}}
+               :stdout {:binding "io.stdout"
+                        :metadata {:fnl/docstring "stdout file"}}
                :tmpfile {:binding "io.tmpfile"
                          :metadata {:fnl/arglist {}
                                     :fnl/docstring "Returns a handle for a temporary file.
@@ -1401,4 +1407,7 @@ after this first result.
 In case of any error,
 `xpcall` returns **false** plus the result from `err`."}}})
 (set docs._G.fields docs)
+(set docs.io.fields.stdin.fields docs.io.fields)
+(set docs.io.fields.stdout.fields docs.io.fields)
+(set docs.io.fields.stderr.fields docs.io.fields)
 docs
diff --git a/src/fennel-ls/docs/lua52.fnl b/src/fennel-ls/docs/lua52.fnl
index d67656d..253acf0 100644
--- a/src/fennel-ls/docs/lua52.fnl
+++ b/src/fennel-ls/docs/lua52.fnl
@@ -577,6 +577,12 @@ or to write data to this program
                :read {:binding "io.read"
                       :metadata {:fnl/arglist ["..."]
                                  :fnl/docstring "Equivalent to `io.input():read(...)`."}}
+               :stderr {:binding "io.stderr"
+                        :metadata {:fnl/docstring "stderr file"}}
+               :stdin {:binding "io.stdin"
+                       :metadata {:fnl/docstring "stdin file"}}
+               :stdout {:binding "io.stdout"
+                        :metadata {:fnl/docstring "stdout file"}}
                :tmpfile {:binding "io.tmpfile"
                          :metadata {:fnl/arglist {}
                                     :fnl/docstring "Returns a handle for a temporary file.
@@ -1656,4 +1662,7 @@ and `\"userdata\"`."}}
                      :fnl/docstring "This function is similar to `pcall`,
 except that it sets a new message handler `msgh`."}}})
 (set docs._G.fields docs)
+(set docs.io.fields.stdin.fields docs.io.fields)
+(set docs.io.fields.stdout.fields docs.io.fields)
+(set docs.io.fields.stderr.fields docs.io.fields)
 docs
diff --git a/src/fennel-ls/docs/lua53.fnl b/src/fennel-ls/docs/lua53.fnl
index 3586f57..44f3527 100644
--- a/src/fennel-ls/docs/lua53.fnl
+++ b/src/fennel-ls/docs/lua53.fnl
@@ -464,6 +464,12 @@ or to write data to this program
                :read {:binding "io.read"
                       :metadata {:fnl/arglist ["..."]
                                  :fnl/docstring "Equivalent to `io.input():read(...)`."}}
+               :stderr {:binding "io.stderr"
+                        :metadata {:fnl/docstring "stderr file"}}
+               :stdin {:binding "io.stdin"
+                       :metadata {:fnl/docstring "stdin file"}}
+               :stdout {:binding "io.stdout"
+                        :metadata {:fnl/docstring "stdout file"}}
                :tmpfile {:binding "io.tmpfile"
                          :metadata {:fnl/arglist {}
                                     :fnl/docstring "In case of success,
@@ -1687,4 +1693,7 @@ negative indices count from the end of the string."}}
                      :fnl/docstring "This function is similar to `pcall`,
 except that it sets a new message handler `msgh`."}}})
 (set docs._G.fields docs)
+(set docs.io.fields.stdin.fields docs.io.fields)
+(set docs.io.fields.stdout.fields docs.io.fields)
+(set docs.io.fields.stderr.fields docs.io.fields)
 docs
diff --git a/src/fennel-ls/docs/lua54.fnl b/src/fennel-ls/docs/lua54.fnl
index 3d1de71..c23ffcd 100644
--- a/src/fennel-ls/docs/lua54.fnl
+++ b/src/fennel-ls/docs/lua54.fnl
@@ -508,6 +508,12 @@ or to write data to this program
                :read {:binding "io.read"
                       :metadata {:fnl/arglist ["..."]
                                  :fnl/docstring "Equivalent to `io.input():read(...)`."}}
+               :stderr {:binding "io.stderr"
+                        :metadata {:fnl/docstring "stderr file"}}
+               :stdin {:binding "io.stdin"
+                       :metadata {:fnl/docstring "stdin file"}}
+               :stdout {:binding "io.stdout"
+                        :metadata {:fnl/docstring "stdout file"}}
                :tmpfile {:binding "io.tmpfile"
                          :metadata {:fnl/arglist {}
                                     :fnl/docstring "In case of success,
@@ -1868,4 +1874,7 @@ it ignores unknown control messages."}}
                      :fnl/docstring "This function is similar to `pcall`,
 except that it sets a new message handler `msgh`."}}})
 (set docs._G.fields docs)
+(set docs.io.fields.stdin.fields docs.io.fields)
+(set docs.io.fields.stdout.fields docs.io.fields)
+(set docs.io.fields.stderr.fields docs.io.fields)
 docs