-'svg-long-desc' => 'Displayed under an SVG image at the image description page. Note that argument 3 is a string that includes the file size unit symbol. See for example [[:File:Yes check.svg]].',
-'svg-long-desc-animated' => 'Displayed under an SVG image at the image description page if the image is animated. Non-animated images use {{msg-mw|svg-long-desc}}. $1 is width, $2 is height, and $3 is file size, including unit (for example "10 KB").',
+'svg-long-desc' => 'Displayed under an SVG image at the image description page. Note that argument 3 is a string that includes the file size unit symbol. See for example [[:File:Yes check.svg]].
+
+Start with a lowercase letter, unless the first word is “SVG”.',
+'svg-long-desc-animated' => 'Displayed under an SVG image at the image description page if the image is animated. Non-animated images use {{msg-mw|svg-long-desc}}. $1 is width, $2 is height, and $3 is file size, including unit (for example "10 KB").
+
+Start with a lowercase letter, unless the first word is “SVG”.',