diff --git a/repo/i18n/api/en.json b/repo/i18n/api/en.json
index d891918e73..316cf8aa85 100644
--- a/repo/i18n/api/en.json
+++ b/repo/i18n/api/en.json
@@ -73,7 +73,7 @@
 	"apihelp-wbformatvalue-param-generate": "The desired output format to generate.",
 	"apihelp-wbformatvalue-param-datatype": "The value's data type. This is distinct from the value's type",
 	"apihelp-wbformatvalue-param-datavalue": "The data to format. This has to be the JSON serialization of a DataValue object.",
-	"apihelp-wbformatvalue-param-options": "The options the formatter should use. Provided as a JSON object.",
+	"apihelp-wbformatvalue-param-options": "The options the formatter should use. Provided as a JSON object.\n\nThe supported options are:\n; $1: The language in which the value should be formatted (a MediaWiki language code).\n; $2: Whether to apply rounding to the number. Can be a boolean (automatic / no rounding) or an integer (exponent of the last significant decimal digits). Only useful for quantity values.\n; $3: Whether to include the unit in the output (a boolean). Only useful for quantity values.\n; $4: Whether to show the calendar model. Can be a boolean (always / never show) or the string <code>\"auto\"</code> (automatically determine whether to show). Only useful for time values.",
 	"apihelp-wbformatvalue-param-property": "Property ID the data value belongs to, should be used instead of the <var>datatype</var> parameter.",
 	"apihelp-wbformatvalue-example-1": "Format a simple string value.",
 	"apihelp-wbformatvalue-example-2": "Format a string value as a URL in HTML.",
diff --git a/repo/i18n/api/qqq.json b/repo/i18n/api/qqq.json
index 471e1c43d6..d047c5bf86 100644
--- a/repo/i18n/api/qqq.json
+++ b/repo/i18n/api/qqq.json
@@ -96,7 +96,7 @@
 	"apihelp-wbformatvalue-param-generate": "{{doc-apihelp-param|wbformatvalue|generate}}",
 	"apihelp-wbformatvalue-param-datatype": "{{doc-apihelp-param|wbformatvalue|datatype}}",
 	"apihelp-wbformatvalue-param-datavalue": "{{doc-apihelp-param|wbformatvalue|datavalue}}",
-	"apihelp-wbformatvalue-param-options": "{{doc-apihelp-param|wbformatvalue|options}}",
+	"apihelp-wbformatvalue-param-options": "{{doc-apihelp-param|wbformatvalue|options|params=* $1, $2, $3, $4 - The names of the four supported options|paramstart=5}}",
 	"apihelp-wbformatvalue-param-property": "{{doc-apihelp-param|wbformatvalue|property}}",
 	"apihelp-wbformatvalue-example-1": "{{doc-apihelp-example|wbformatvalue}}",
 	"apihelp-wbformatvalue-example-2": "{{doc-apihelp-example|wbformatvalue}}",
diff --git a/repo/includes/Api/FormatSnakValue.php b/repo/includes/Api/FormatSnakValue.php
index 5905b4d628..296d4b6dcc 100644
--- a/repo/includes/Api/FormatSnakValue.php
+++ b/repo/includes/Api/FormatSnakValue.php
@@ -362,6 +362,13 @@ protected function getAllowedParams(): array {
 			'options' => [
 				ParamValidator::PARAM_TYPE => 'text',
 				ParamValidator::PARAM_REQUIRED => false,
+				ApiBase::PARAM_HELP_MSG => [
+					'apihelp-wbformatvalue-param-options',
+					ValueFormatter::OPT_LANG,
+					QuantityFormatter::OPT_APPLY_ROUNDING,
+					QuantityFormatter::OPT_APPLY_UNIT,
+					ShowCalendarModelDecider::OPT_SHOW_CALENDAR,
+				],
 			],
 		];
 	}