diff --git a/askama_derive/src/generator/filter.rs b/askama_derive/src/generator/filter.rs
index cb27d43a..4a7ead5f 100644
--- a/askama_derive/src/generator/filter.rs
+++ b/askama_derive/src/generator/filter.rs
@@ -232,11 +232,11 @@ impl<'a> Generator<'a, '_> {
         const ARGUMENTS: &[&FilterArgument; 3] = &[
             FILTER_SOURCE,
             &FilterArgument {
-                name: "sg",
+                name: "singular",
                 default_value: Some(SINGULAR),
             },
             &FilterArgument {
-                name: "pl",
+                name: "plural",
                 default_value: Some(PLURAL),
             },
         ];
diff --git a/book/src/filters.md b/book/src/filters.md
index c38b4f77..27e61714 100644
--- a/book/src/filters.md
+++ b/book/src/filters.md
@@ -22,10 +22,10 @@ Built-in filters that take (optional) arguments can be called with named argumen
 The order of the named arguments does not matter, but named arguments must come after
 positional (i.e. unnamed) arguments.
 
-E.g. the filter `pluralize` takes two optional arguments: `sg` and `pl` (singular and plural),
-which are `sg = ""` and `pl = "s"` by default.
+E.g. the filter `pluralize` takes two optional arguments: `singular` and `plural`
+which are `singular = ""` and `plural = "s"` by default.
 If you are fine with the default empty string for the singular, and you only want to set a
-specific plural, then you can call the filter like `dog{{ count | pluralize(pl = "gies") }}`.
+specific plural, then you can call the filter like `dog{{ count | pluralize(plural = "gies") }}`.
 
 ### capitalize
 [#capitalize]: #capitalize
@@ -415,7 +415,7 @@ hello
 
 ```jinja
 {{ integer | pluralize }}
-{{ integer | pluralize([sg = ""], [pl = "s"]) }}
+{{ integer | pluralize([singular = ""], [plural = "s"]) }}
 ```
 
 <hr style="clear:both; border:0; border-bottom:1pt solid currentColor">
diff --git a/testing/tests/named_filter_arguments.rs b/testing/tests/named_filter_arguments.rs
index 5ac4637e..04b624de 100644
--- a/testing/tests/named_filter_arguments.rs
+++ b/testing/tests/named_filter_arguments.rs
@@ -29,7 +29,7 @@ fn test_pluralize_two_positional_args() {
 fn test_pluralize_positional_and_named() {
     #[derive(Template)]
     #[template(
-        source = r#"I have {{ count }} butterfl{{ count | pluralize("y", pl = "ies") }}."#,
+        source = r#"I have {{ count }} butterfl{{ count | pluralize("y", plural = "ies") }}."#,
         ext = "txt"
     )]
     struct CountButterflies {
@@ -54,7 +54,7 @@ fn test_pluralize_positional_and_named() {
 fn test_pluralize_named_reordered() {
     #[derive(Template)]
     #[template(
-        source = r#"I have {{ count }} butterfl{{ count | pluralize(pl = "ies", sg = "y") }}."#,
+        source = r#"I have {{ count }} butterfl{{ count | pluralize(plural = "ies", singular = "y") }}."#,
         ext = "txt"
     )]
     struct CountButterflies {
@@ -79,7 +79,7 @@ fn test_pluralize_named_reordered() {
 fn test_pluralize_defaulted_and_named() {
     #[derive(Template)]
     #[template(
-        source = r#"I have {{ count }} potato{{ count | pluralize(pl = "es") }}."#,
+        source = r#"I have {{ count }} potato{{ count | pluralize(plural = "es") }}."#,
         ext = "txt"
     )]
     struct CountPotatoes {
diff --git a/testing/tests/ui/named_filter_arguments.rs b/testing/tests/ui/named_filter_arguments.rs
index 443e9b79..bc04349c 100644
--- a/testing/tests/ui/named_filter_arguments.rs
+++ b/testing/tests/ui/named_filter_arguments.rs
@@ -2,7 +2,7 @@ use askama::Template;
 
 #[derive(Template)]
 #[template(
-    source = r#"I have {{ count }} butterfl{{ count | pluralize(pl = "ies", "y") }}."#,
+    source = r#"I have {{ count }} butterfl{{ count | pluralize(plural = "ies", "y") }}."#,
     ext = "txt"
 )]
 struct PositionalAfterNamed {
@@ -11,7 +11,7 @@ struct PositionalAfterNamed {
 
 #[derive(Template)]
 #[template(
-    source = r#"I have {{ count }} butterfl{{ count | pluralize(pl = "y", pl = "ies") }}."#,
+    source = r#"I have {{ count }} butterfl{{ count | pluralize(plural = "y", plural = "ies") }}."#,
     ext = "txt"
 )]
 struct NamedRepeated {
@@ -20,7 +20,7 @@ struct NamedRepeated {
 
 #[derive(Template)]
 #[template(
-    source = r#"I have {{ count }} butterfl{{ count | pluralize("y", sg = "ies") }}."#,
+    source = r#"I have {{ count }} butterfl{{ count | pluralize("y", pl = "ies") }}."#,
     ext = "txt"
 )]
 struct NamedButAlreadyPositional {
@@ -29,7 +29,7 @@ struct NamedButAlreadyPositional {
 
 #[derive(Template)]
 #[template(
-    source = r#"I have {{ count }} butterfl{{ count | pluralize("y", plural = "ies") }}."#,
+    source = r#"I have {{ count }} butterfl{{ count | pluralize("y", sg = "ies") }}."#,
     ext = "txt"
 )]
 struct NoSuchNamedArgument {
diff --git a/testing/tests/ui/named_filter_arguments.stderr b/testing/tests/ui/named_filter_arguments.stderr
index 1dc90593..702ae97a 100644
--- a/testing/tests/ui/named_filter_arguments.stderr
+++ b/testing/tests/ui/named_filter_arguments.stderr
@@ -1,34 +1,34 @@
 error: named arguments must always be passed last
  --> <source attribute>:1:47
-       "(pl = \"ies\", \"y\") }}."
+       "(plural = \"ies\", \"y\") }}."
  --> tests/ui/named_filter_arguments.rs:5:14
   |
-5 |     source = r#"I have {{ count }} butterfl{{ count | pluralize(pl = "ies", "y") }}."#,
-  |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+5 |     source = r#"I have {{ count }} butterfl{{ count | pluralize(plural = "ies", "y") }}."#,
+  |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: named argument `pl` was passed more than once
+error: named argument `plural` was passed more than once
  --> <source attribute>:1:47
-       "(pl = \"y\", pl = \"ies\") }}."
+       "(plural = \"y\", plural = \"ies\") }}."
   --> tests/ui/named_filter_arguments.rs:14:14
    |
-14 |     source = r#"I have {{ count }} butterfl{{ count | pluralize(pl = "y", pl = "ies") }}."#,
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+14 |     source = r#"I have {{ count }} butterfl{{ count | pluralize(plural = "y", plural = "ies") }}."#,
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: `sg` argument to `pluralize` filter was already set; its arguments are: ([sg], [pl])
+error: `pluralize` filter does not have an argument `pl`; its arguments are: ([singular], [plural])
  --> NamedButAlreadyPositional.txt:1:47
-       "(\"y\", sg = \"ies\") }}."
+       "(\"y\", pl = \"ies\") }}."
   --> tests/ui/named_filter_arguments.rs:23:14
    |
-23 |     source = r#"I have {{ count }} butterfl{{ count | pluralize("y", sg = "ies") }}."#,
+23 |     source = r#"I have {{ count }} butterfl{{ count | pluralize("y", pl = "ies") }}."#,
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: `pluralize` filter does not have an argument `plural`; its arguments are: ([sg], [pl])
+error: `pluralize` filter does not have an argument `sg`; its arguments are: ([singular], [plural])
  --> NoSuchNamedArgument.txt:1:47
-       "(\"y\", plural = \"ies\") }}."
+       "(\"y\", sg = \"ies\") }}."
   --> tests/ui/named_filter_arguments.rs:32:14
    |
-32 |     source = r#"I have {{ count }} butterfl{{ count | pluralize("y", plural = "ies") }}."#,
-   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+32 |     source = r#"I have {{ count }} butterfl{{ count | pluralize("y", sg = "ies") }}."#,
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: `uppercase` filter does not have any arguments
  --> NamedArgumentButNoArgumentExpected.txt:1:30