diff --git a/NEWS.md b/NEWS.md
index b28fd363..1ca4c996 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,7 +1,8 @@
 # leaflet.extras2 (development version)
 
 * Included [Leaflet TimeSlider](https://github.com/dwilhelm89/LeafletSlider) plugin
-* `addWMS` gained the `popupOptions` parameter
+* `addWMS` gained the `layerId` argument and works like `leaflet::addWMSTiles` except for the `popupOptions`
+* `Side-by-Side` doesn't propagate click events when dragging. Thanks to `f905a47` of [#23](https://github.com/digidem/leaflet-side-by-side/pull/23) 
 
 # leaflet.extras2 1.0.0
 
diff --git a/R/wms.R b/R/wms.R
index 92086575..e4fea31d 100644
--- a/R/wms.R
+++ b/R/wms.R
@@ -15,12 +15,6 @@ wmsDependency <- function() {
 #' single-tile/untiled/nontiled layers, shared WMS sources, and
 #' GetFeatureInfo-powered identify.
 #' @inheritParams leaflet::addWMSTiles
-#' @param layers vector or list of WMS layers to show. The name of the layer is
-#'   used as the \code{layerId} (for \code{\link[leaflet]{removeTiles}}
-#'   purposes)
-#' @param group the name of the group the newly created layers should belong to.
-#'   If \code{layers} contains multiple elements, the \code{layers} names are
-#'   used as group-names.
 #' @param popupOptions List of popup options. See
 #'   \code{\link[leaflet]{popupOptions}}. Default is NULL.
 #' @inherit leaflet::addWMSTiles return
@@ -41,19 +35,21 @@ wmsDependency <- function() {
 #'         transparent = TRUE,
 #'         format = "image/png",
 #'         info_format = "text/html"))
-addWMS <- function(map, baseUrl, layers = NULL, group = NULL,
-                   options = WMSTileOptions(), attribution = NULL,
+addWMS <- function(map, baseUrl, layerId = NULL, group = NULL,
+                   options = WMSTileOptions(),
+                   attribution = NULL,
+                   layers = NULL,
                    popupOptions = NULL,
                    data = getMapData(map)) {
 
   if (is.null(layers)) {
-    stop("layers is a required argument")
+    stop("layers is a required argument with comma-separated list of WMS layers to show")
   }
   options$attribution <- attribution
-  # options$layers <- layers
+  options$layers <- layers
 
   map$dependencies <- c(map$dependencies, wmsDependency())
 
-  invokeMethod(map, data, "addWMS", baseUrl, layers,
+  invokeMethod(map, data, "addWMS", baseUrl, layerId,
                group, options, popupOptions)
 }
diff --git a/inst/htmlwidgets/lfx-side-by-side/lfx-side-by-side.js b/inst/htmlwidgets/lfx-side-by-side/lfx-side-by-side.js
index 6d454a46..b0d0e810 100644
--- a/inst/htmlwidgets/lfx-side-by-side/lfx-side-by-side.js
+++ b/inst/htmlwidgets/lfx-side-by-side/lfx-side-by-side.js
@@ -79,6 +79,7 @@
 
         this._divider = L.DomUtil.create('div', 'leaflet-sbs-divider', container)
         var range = this._range = L.DomUtil.create('input', 'leaflet-sbs-range', container)
+        range.addEventListener('click', function (e) { e.stopPropagation() })
         range.type = 'range'
         range.min = 0
         range.max = 1
diff --git a/inst/htmlwidgets/lfx-wms/leaflet.wms-bindings.js b/inst/htmlwidgets/lfx-wms/leaflet.wms-bindings.js
index 1f43a164..09f5e61f 100644
--- a/inst/htmlwidgets/lfx-wms/leaflet.wms-bindings.js
+++ b/inst/htmlwidgets/lfx-wms/leaflet.wms-bindings.js
@@ -1,4 +1,4 @@
-LeafletWidget.methods.addWMS = function(baseUrl, layers, group, options, popupOptions) {
+LeafletWidget.methods.addWMS = function(baseUrl, layerId, group, options, popupOptions) {
 
   if(options && options.crs) {
     options.crs = LeafletWidget.utils.getCRS(options.crs);
@@ -11,6 +11,8 @@ LeafletWidget.methods.addWMS = function(baseUrl, layers, group, options, popupOp
         if (!this._map) {
             return;
         }
+
+        // TODO - Check if body is empty?
         this._map.openPopup(info, latlng, popupOptions);
 
         // Adaptation for R/Shiny
@@ -21,16 +23,7 @@ LeafletWidget.methods.addWMS = function(baseUrl, layers, group, options, popupOp
     }
   });
 
-
   // Add WMS source
   var source = L.wms.source(baseUrl, options);
-
-  // Add layers
-  if (typeof(layers) === "string") {
-    var layer = source.getLayer(layers);
-    this.layerManager.addLayer(layer, "tile", layers, group);
-  } else {
-    layers.forEach(e => this.layerManager.addLayer(
-      source.getLayer(e), "tile", e, e));
-  }
+  this.layerManager.addLayer(source.getLayer(options.layers), "tile", layerId, group);
 };
diff --git a/man/addWMS.Rd b/man/addWMS.Rd
index 9053cd65..17c8acc5 100644
--- a/man/addWMS.Rd
+++ b/man/addWMS.Rd
@@ -7,10 +7,11 @@
 addWMS(
   map,
   baseUrl,
-  layers = NULL,
+  layerId = NULL,
   group = NULL,
   options = WMSTileOptions(),
   attribution = NULL,
+  layers = NULL,
   popupOptions = NULL,
   data = getMapData(map)
 )
@@ -20,19 +21,21 @@ addWMS(
 
 \item{baseUrl}{a base URL of the WMS service}
 
-\item{layers}{vector or list of WMS layers to show. The name of the layer is
-used as the \code{layerId} (for \code{\link[leaflet]{removeTiles}}
-purposes)}
+\item{layerId}{the layer id}
 
-\item{group}{the name of the group the newly created layers should belong to.
-If \code{layers} contains multiple elements, the \code{layers} names are
-used as group-names.}
+\item{group}{the name of the group the newly created layers should belong to
+(for \code{\link[leaflet]{clearGroup}} and \code{\link[leaflet]{addLayersControl}} purposes).
+Human-friendly group names are permitted--they need not be short,
+identifier-style names. Any number of layers and even different types of
+layers (e.g. markers and polygons) can share the same group name.}
 
 \item{options}{a list of extra options for tile layers, popups, paths
 (circles, rectangles, polygons, ...), or other map elements}
 
 \item{attribution}{the attribution text of the tile layer (HTML)}
 
+\item{layers}{comma-separated list of WMS layers to show}
+
 \item{popupOptions}{List of popup options. See
 \code{\link[leaflet]{popupOptions}}. Default is NULL.}