diff --git a/extension.json b/extension.json
index d24230b6..139df767 100644
--- a/extension.json
+++ b/extension.json
@@ -121,8 +121,8 @@
 			],
 			"messages": [
 				"colon-separator",
-				"word-separator",
-				"revisionslider-bytes",
+				"revisionslider-page-size",
+				"revisionslider-change-size",
 				"revisionslider-label-date",
 				"revisionslider-label-page-size",
 				"revisionslider-label-change-size",
diff --git a/i18n/en.json b/i18n/en.json
index 1df96391..f43cf67e 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -8,7 +8,8 @@
     "revisionslider-desc": "Shows a slider allowing selecting and comparing of revisions on a diff page",
     "revisionslider-beta-feature-message": "RevisionSlider",
     "revisionslider-beta-feature-description": "Show a revision slider when comparing two revisions of a page.",
-    "revisionslider-bytes": "{{PLURAL:$1|byte|bytes}}",
+    "revisionslider-page-size": "$1 {{PLURAL:$2|byte|bytes}}",
+    "revisionslider-change-size": "$1 {{PLURAL:$3|byte|bytes}}",
     "revisionslider-label-date": "Date",
     "revisionslider-label-page-size": "Page size",
     "revisionslider-label-change-size": "Change size",
diff --git a/i18n/qqq.json b/i18n/qqq.json
index bfd577a6..c96d1c75 100644
--- a/i18n/qqq.json
+++ b/i18n/qqq.json
@@ -10,7 +10,8 @@
 	"revisionslider-desc": "{{desc|name=RevisionSlider|url=https://www.mediawiki.org/wiki/Extension:RevisionSlider}}",
 	"revisionslider-beta-feature-message": "Label for the RevisionSlider Beta Feature.",
 	"revisionslider-beta-feature-description": "Description for the RevisionSlider Beta Feature, describing the feature that will be enabled.",
-	"revisionslider-bytes": "Unit (bytes) used along with revision/change size.\n\nParameters:\n$1 - number of bytes\n{{Identical|Byte}}",
+	"revisionslider-page-size": "Page size after the revision.\n\nParameters:\n$1 - number of bytes formatted for output (with mw.language.converNumber)\n$2 - number of bytes, could be used with PLURAL",
+	"revisionslider-change-size": "Change size, ie. number of bytes added or removed in the revision.\n\nParameters:\n$1 - change size formatted for output (colour-coded HTML element, including plus or minus sign)\n$2 - change size (in bytes), can be negative\n$3 - change size (in bytes) without a sign",
 	"revisionslider-label-date": "Label for the creation date of the revision.\n{{Identical|Date}}",
 	"revisionslider-label-page-size": "Label for the size of the revision.\n{{Identical|Page size}}",
 	"revisionslider-label-change-size": "Label for the size of the change compared to the revision before.",
diff --git a/modules/ext.RevisionSlider.RevisionListView.js b/modules/ext.RevisionSlider.RevisionListView.js
index f44b44fb..299680ca 100644
--- a/modules/ext.RevisionSlider.RevisionListView.js
+++ b/modules/ext.RevisionSlider.RevisionListView.js
@@ -260,9 +260,7 @@
 		makePageSizeLine: function ( size ) {
 			return $( '<p>' ).append(
 				$( '<strong>' ).text( mw.msg( 'revisionslider-label-page-size' ) + mw.msg( 'colon-separator' ) ),
-				mw.language.convertNumber( size ),
-				mw.msg( 'word-separator' ),
-				mw.msg( 'revisionslider-bytes', size )
+				mw.msg( 'revisionslider-page-size', mw.language.convertNumber( size ), size )
 			);
 		},
 
@@ -293,9 +291,7 @@
 
 			return $( '<p>' ).append(
 				$( '<strong>' ).text( mw.msg( 'revisionslider-label-change-size' ) + mw.msg( 'colon-separator' ) ),
-				$changeNumber,
-				mw.msg( 'word-separator' ),
-				mw.msg( 'revisionslider-bytes', relativeSize )
+				mw.message( 'revisionslider-change-size', $changeNumber, relativeSize, Math.abs( relativeSize ) ).parse()
 			);
 		}
 	} );