diff --git a/TODO.md b/TODO.md
index e4b6807..049a451 100644
--- a/TODO.md
+++ b/TODO.md
@@ -68,10 +68,6 @@ To see what's happening in a section, click on the arrow symbol (▶).
 ## In Progress...
 
 <details><summary></summary>
-
-- [ ] Create the `_23_metaprogramming.jl` file:
-      [`metaprogramming`](https://github.com/udohjeremiah/REPLference.jl/tree/metaprogramming)
-      [@udohjeremiah](https://github.com/udohjeremiah)
 </details>
 
 ## Done ✓
@@ -84,4 +80,6 @@ To see what's happening in a section, click on the arrow symbol (▶).
 - [x] Create the `.JuliaFormatter.jl` file and use `BlueStyle`:
       [`#60`](https://github.com/udohjeremiah/REPLference.jl/pull/60)
       [@udohjeremiah](https://github.com/udohjeremiah)
+- [x] Create the `_23_metaprogramming.jl` file:
+      [`#64`](https://github.com/udohjeremiah/REPLference.jl/pull/64)
 </details>
diff --git a/src/REPLference.jl b/src/REPLference.jl
index 5ffda05..e9dcaad 100644
--- a/src/REPLference.jl
+++ b/src/REPLference.jl
@@ -23,6 +23,7 @@ include("_19_module.jl")
 include("_20_regex.jl")
 include("_21_date.jl")
 include("_22_random.jl")
+include("_23_metaprogramming.jl")
 
 import Dates: AbstractTime
 import .Docs: doc
@@ -76,136 +77,142 @@ function subtree end
 function man(obj::Symbol)
     str = string(obj)
     # keywords
-    if match(r"^(?:keyword|reserved)"i, str) != nothing
+    if match(r"^(?:keyword|reserved)"i, str) !== nothing
         doc(keywords)
         # variables
-    elseif match(r"^variable"i, str) != nothing
+    elseif match(r"^variable"i, str) !== nothing
         doc(variables)
         # operators
-    elseif match(r"^operat(?:or|ion)"i, str) != nothing
+    elseif match(r"^operat(?:or|ion)"i, str) !== nothing
         doc(operators)
         # integers
-    elseif match(r"^integer"i, str) != nothing
+    elseif match(r"^integer"i, str) !== nothing
         doc(integers)
         # floating points
-    elseif match(r"^float"i, str) != nothing
+    elseif match(r"^float"i, str) !== nothing
         doc(floats)
         # complex numbers
-    elseif match(r"^complex"i, str) != nothing
+    elseif match(r"^complex"i, str) !== nothing
         doc(complexs)
         # rational numbers
-    elseif match(r"^rational"i, str) != nothing
+    elseif match(r"^rational"i, str) !== nothing
         doc(rationals)
         # irrationals
-    elseif match(r"^irrational"i, str) != nothing
+    elseif match(r"^irrational"i, str) !== nothing
         doc(irrationals)
         # characters
-    elseif match(r"^character"i, str) != nothing
+    elseif match(r"^character"i, str) !== nothing
         doc(characters)
         # strings
-    elseif match(r"^string"i, str) != nothing
+    elseif match(r"^string"i, str) !== nothing
         doc(strings)
         # ranges
-    elseif match(r"^range"i, str) != nothing
+    elseif match(r"^range"i, str) !== nothing
         doc(ranges)
         # arrays
-    elseif match(r"^array"i, str) != nothing
+    elseif match(r"^array"i, str) !== nothing
         doc(arrays)
         # tuples
-    elseif match(r"^(?:tuple|named(.)?tuple)"i, str) != nothing
+    elseif match(r"^(?:tuple|named(.)?tuple)"i, str) !== nothing
         doc(tuples)
         # dictionaries
-    elseif match(r"^dict"i, str) != nothing
+    elseif match(r"^dict"i, str) !== nothing
         doc(dicts)
         # sets
-    elseif match(r"^set"i, str) != nothing
+    elseif match(r"^set"i, str) !== nothing
         doc(sets)
         # types
-    elseif match(r"^(?:type|datatype)"i, str) != nothing
+    elseif match(r"^(?:type|datatype)"i, str) !== nothing
         doc(types)
         # function
-    elseif match(r"^(?:function|method|procedure)"i, str) != nothing
+    elseif match(r"^(?:function|method|procedure)"i, str) !== nothing
         doc(functions)
         # files
-    elseif match(r"^(?:file|io|stream)"i, str) != nothing
+    elseif match(r"^(?:file|io|stream)"i, str) !== nothing
         doc(files)
         # modules
-    elseif match(r"^(?:module|package)"i, str) != nothing
+    elseif match(r"^(?:module|package)"i, str) !== nothing
         doc(modules)
         # regexes
-    elseif match(r"^reg(?:ex|ular)"i, str) != nothing
+    elseif match(r"^reg(?:ex|ular)"i, str) !== nothing
         doc(regexes)
         # time and date
-    elseif match(r"^(?:time|date)"i, str) != nothing
+    elseif match(r"^(?:time|date)"i, str) !== nothing
         doc(datetime)
         # random numbers
-    elseif match(r"^rand"i, str) != nothing
+    elseif match(r"^rand"i, str) !== nothing
         doc(randoms)
+        # metaprogramming
+    elseif match(r"^meta"i, str) !== nothing
+        doc(metaprogramming)
     end
 end
 
 function fun(obj::Symbol; extmod=false)
     str = string(obj)
     # operators
-    if match(r"operat(?:or|ion)"i, str) != nothing
+    if match(r"operat(?:or|ion)"i, str) !== nothing
         operators(; extmod=extmod)
         # integers
-    elseif match(r"^integer"i, str) != nothing
+    elseif match(r"^integer"i, str) !== nothing
         integers(; extmod=extmod)
         # floating points
-    elseif match(r"^float"i, str) != nothing
+    elseif match(r"^float"i, str) !== nothing
         floats(; extmod=extmod)
         # complex numbers
-    elseif match(r"^complex"i, str) != nothing
+    elseif match(r"^complex"i, str) !== nothing
         complexs(; extmod=extmod)
         # rational numbers
-    elseif match(r"^rational"i, str) != nothing
+    elseif match(r"^rational"i, str) !== nothing
         rationals(; extmod=extmod)
         # irrationals
-    elseif match(r"^irrational"i, str) != nothing
+    elseif match(r"^irrational"i, str) !== nothing
         irrationals(; extmod=extmod)
         # characters
-    elseif match(r"^character"i, str) != nothing
+    elseif match(r"^character"i, str) !== nothing
         characters(; extmod=extmod)
         # strings
-    elseif match(r"^string"i, str) != nothing
+    elseif match(r"^string"i, str) !== nothing
         strings(; extmod=extmod)
         # ranges
-    elseif match(r"^range"i, str) != nothing
+    elseif match(r"^range"i, str) !== nothing
         ranges(; extmod=extmod)
         # arrays
-    elseif match(r"^array"i, str) != nothing
+    elseif match(r"^array"i, str) !== nothing
         arrays(; extmod=extmod)
         # tuples
-    elseif match(r"^(?:tuple|named(.)?tuple)"i, str) != nothing
+    elseif match(r"^(?:tuple|named(.)?tuple)"i, str) !== nothing
         tuples(; extmod=extmod)
         # dictionaries
-    elseif match(r"^dict"i, str) != nothing
+    elseif match(r"^dict"i, str) !== nothing
         dicts(; extmod=extmod)
         # sets
-    elseif match(r"^set"i, str) != nothing
+    elseif match(r"^set"i, str) !== nothing
         sets(; extmod=extmod)
         # types
-    elseif match(r"^(?:type|datatype)"i, str) != nothing
+    elseif match(r"^(?:type|datatype)"i, str) !== nothing
         types()
         # function
-    elseif match(r"^(?:function|method|procedure)"i, str) != nothing
+    elseif match(r"^(?:function|method|procedure)"i, str) !== nothing
         functions(; extmod=extmod)
         # files
-    elseif match(r"^(?:file|io|stream)"i, str) != nothing
+    elseif match(r"^(?:file|io|stream)"i, str) !== nothing
         files(; extmod=extmod)
         # modules
-    elseif match(r"^(?:module|package)"i, str) != nothing
+    elseif match(r"^(?:module|package)"i, str) !== nothing
         modules(; extmod=extmod)
         # regexes
-    elseif match(r"^re(?:gex|gular)"i, str) != nothing
+    elseif match(r"^re(?:gex|gular)"i, str) !== nothing
         regexes(; extmod=extmod)
         # time and date
-    elseif match(r"^(?:time|date)"i, str) != nothing
+    elseif match(r"^(?:time|date)"i, str) !== nothing
         datetime(; extmod=extmod)
         # random numbers
-    elseif match(r"^rand"i, str) != nothing
+    elseif match(r"^rand"i, str) !== nothing
         randoms(; extmod=extmod)
+        # metaprogramming
+    elseif match(r"^meta"i, str) !== nothing
+        metaprogramming(; extmod=extmod)
     end
 end
 
diff --git a/src/_23_metaprogramming.jl b/src/_23_metaprogramming.jl
index dfc1a9a..6834394 100644
--- a/src/_23_metaprogramming.jl
+++ b/src/_23_metaprogramming.jl
@@ -1740,7 +1740,7 @@ function metaprogramming(; extmod=false)
     ]
     types = ["Types" => ["DataType", "Expr", "Meta.ParseErrorˣ", "QuoteNode", "Symbol"]]
     operators = ["Operators" => [":"]]
-    stdlib => ["Stdlib" => ["Printf.@printf", "Printf.@sprintf"]]
+    stdlib = ["Stdlib" => ["Printf.@printf", "Printf.@sprintf"]]
     _print_names(macros, methods, types, operators)
     if extmod == true
         _print_names(stdlib)
diff --git a/test/runtests.jl b/test/runtests.jl
index 6d51bdc..63b1419 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -40,6 +40,7 @@ using Test
     @test typeof(man(:regex)) === Markdown.MD
     @test typeof(man(:time)) === Markdown.MD
     @test typeof(man(:random)) === Markdown.MD
+    @test typeof(man(:meta)) === Markdown.MD
 
     @test man(:keywords) == man(:reserved)
     @test man(:operators) == man(:operations)
@@ -72,6 +73,7 @@ using Test
     @test fun(:files) === nothing
     @test fun(:modules) === nothing
     @test fun(:regex) === nothing
+    @test fun(:meta) === nothing
 
     @test fun(:keywords) == fun(:reserved)
     @test fun(:operators) == fun(:operations)
@@ -104,6 +106,7 @@ using Test
     @test fun(:files; extmod=true) === nothing
     @test fun(:modules; extmod=true) === nothing
     @test fun(:regex; extmod=true) === nothing
+    @test fun(:meta; extmod=true) === nothing
 
     @test subtree(Number) === nothing
     @test subtree(Vector) === nothing