diff --git a/src/lib.rs b/src/lib.rs
index 277c985..97ca1bc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -37,13 +37,15 @@
 //! $$ \Sigma_{cmd} = \\{x | 0 \leqslant x \leqslant 9\\} \cup \\{x | "a" \leqslant x \leqslant "z"\\} \cup \\{x | "A" \leqslant x \leqslant "Z"\\} \cup \\{"\\_", "\text{-}", "."\\} $$
 //!
 //! ## Argument
-//! Arguments are similar to the command, although they can also contain spaces and quotes,
-//! if it's quoted and additional characters (here notated as "$\\dots{}$"):
-//! $$ \Sigma_{args-quoted} = \Sigma_{cmd} \cup \\{"\\text{"}", "\\ ", \\dots{}\\} $$
-//! $$ \Sigma_{args-single-quoted} = \Sigma_{cmd} \cup \\{"'", "\\ ", \\dots{}\\} $$
-//! $$ \Sigma_{args} = \Sigma_{cmd} \cup \\{\\dots{}\\} $$
-//! Look at the [trinitry.pest](../../../src/trinitry.pest) file for a full list of the additional
-//! allowed characters.
+//! Arguments constructed from the same alphabet as the commands, but can contain additional chars
+//! listed in the [trinitry.pest](../../../src/trinitry.pest) file.
+//! $$ \Sigma_{args} = \Sigma_{cmd} \cup{} \\{\\dots{}\\} $$
+//!
+//! Besides the extra chars outlined above the arguments can also contain
+//! spaces and quotes, if they are quoted. Quoted args are either double quoted, and can thus
+//! contain single quotes, or single quoted, and can contain double quotes.
+//! $$ \Sigma_{args-double-quoted} = \Sigma_{args} \cup \\{"\\text{\\texttt{'}}", "\\ "} $$
+//! $$ \Sigma_{args-single-quoted} = \Sigma_{args} \cup \\{"\\text{\\texttt{"}}", "\\ "} $$
 //!
 //! # Examples
 //! ## Command
@@ -61,7 +63,7 @@
 //! ```text
 //! lua "function() print('Hi!') end"
 //! ```
-//! Whilst this would not be valid (that is, it would very likely not be what you want):
+//! Whilst this would not be valid (it is actually valid, but results in something, you likely did not expect):
 //! ```text
 //! lua "function() print("Hi!") end"
 //! ```
diff --git a/src/trinitry.pest b/src/trinitry.pest
index e42d49d..e1333fd 100644
--- a/src/trinitry.pest
+++ b/src/trinitry.pest
@@ -18,12 +18,32 @@
 // and the Lesser GNU General Public License along with this program.
 // If not, see <https://www.gnu.org/licenses/>.
 
-chars = { ASCII_ALPHANUMERIC | "_" | "-" | "."  }
+command_chars = { ASCII_ALPHANUMERIC | "_" | "-" | "."  }
 
-// TODO(@soispha): Are these all the valid characters? <2023-11-01>
-argument_chars = { chars | "(" | ")" | "{" | "}" | "<" | ">" | "?" | "!" | "+" | "^" | "@"
-| "&" | "*" | "~" | "|" | "=" | "," | "\\" | "/" }
-whitespace = _{ " " } // lower case to avoid special treatment of 'WHITESPACE'
+argument_chars = {
+            command_chars |
+            "("   |
+            ")"   |
+            "{"   |
+            "}"   |
+            "<"   |
+            ">"   |
+            "?"   |
+            "!"   |
+            "+"   |
+            "^"   |
+            "@"   |
+            "&"   |
+            "*"   |
+            "~"   |
+            "|"   |
+            "="   |
+            ","   |
+            "\\"  |
+            "/"
+}
+
+whitespace = _{ " " } // lower case to avoid the special treatment of `WHITESPACE`
 
 quote = _{ "\"" }
 q = _{ quote }
@@ -33,7 +53,7 @@ sq = _{ single_quote }
 
 
 
-command = { chars+ }
+command = { command_chars+ }
 
 arg_quoted = { q ~ (!q ~ (argument_chars | " " | "'" ))+ ~ q }
 arg_single_quoted = { sq ~ (!sq ~ (argument_chars | " " | "\"" ))+ ~ sq }
@@ -43,3 +63,6 @@ argument = { whitespace+ ~ (arg_quoted | arg_single_quoted | arg )}
 
 
 trinitry = { SOI ~ #command = command ~ (#argument = argument)* ~ EOI }
+
+// better than no syntax highlight:
+// vim: ft=javascript