diff --git a/src/core/config/Categories.json b/src/core/config/Categories.json
index 8235ab10..f8f29be9 100755
--- a/src/core/config/Categories.json
+++ b/src/core/config/Categories.json
@@ -359,7 +359,11 @@
             "Play Media",
             "Remove EXIF",
             "Extract EXIF",
-            "Split Colour Channels"
+            "Split Colour Channels",
+            "Hex Density chart",
+            "Scatter chart",
+            "Series chart",
+            "Heatmap chart"
         ]
     },
     {
diff --git a/src/core/operations/HeatmapChart.mjs b/src/core/operations/HeatmapChart.mjs
index 9852a4ad..6620e7aa 100644
--- a/src/core/operations/HeatmapChart.mjs
+++ b/src/core/operations/HeatmapChart.mjs
@@ -26,8 +26,8 @@ class HeatmapChart extends Operation {
 
         this.name = "Heatmap chart";
         this.module = "Charts";
-        this.description = "";
-        this.infoURL = "";
+        this.description = "A heatmap is a graphical representation of data where the individual values contained in a matrix are represented as colors.";
+        this.infoURL = "https://wikipedia.org/wiki/Heat_map";
         this.inputType = "string";
         this.outputType = "html";
         this.args = [
@@ -85,6 +85,8 @@ class HeatmapChart extends Operation {
     }
 
     /**
+     * Heatmap chart operation.
+     *
      * @param {string} input
      * @param {Object[]} args
      * @returns {html}
@@ -99,7 +101,6 @@ class HeatmapChart extends Operation {
             minColour = args[8],
             maxColour = args[9],
             dimension = 500;
-        
         if (vBins <= 0) throw new OperationError("Number of vertical bins must be greater than 0");
         if (hBins <= 0) throw new OperationError("Number of horizontal bins must be greater than 0");
 
@@ -182,7 +183,7 @@ class HeatmapChart extends Operation {
             .attr("stroke-width", drawEdges ? "0.5" : "none")
             .append("title")
             .text(d => {
-                let count = d.length,
+                const count = d.length,
                     perc = 100.0 * d.length / values.length,
                     tooltip = `Count: ${count}\n
                                Percentage: ${perc.toFixed(2)}%\n
@@ -218,7 +219,7 @@ class HeatmapChart extends Operation {
 
     /**
      * Packs a list of x, y coordinates into a number of bins for use in a heatmap.
-     * 
+     *
      * @param {Object[]} points
      * @param {number} number of vertical bins
      * @param {number} number of horizontal bins
diff --git a/src/core/operations/HexDensityChart.mjs b/src/core/operations/HexDensityChart.mjs
index dc04bf33..c9912599 100644
--- a/src/core/operations/HexDensityChart.mjs
+++ b/src/core/operations/HexDensityChart.mjs
@@ -25,8 +25,7 @@ class HexDensityChart extends Operation {
 
         this.name = "Hex Density chart";
         this.module = "Charts";
-        this.description = "";
-        this.infoURL = "";
+        this.description = "Hex density charts are used in a similar way to scatter charts, however rather than rendering tens of thousands of points, it groups the points into a few hundred hexagons to show the distribution.";
         this.inputType = "string";
         this.outputType = "html";
         this.args = [
@@ -90,6 +89,8 @@ class HexDensityChart extends Operation {
 
 
     /**
+     * Hex Bin chart operation.
+     *
      * @param {string} input
      * @param {Object[]} args
      * @returns {html}
diff --git a/src/core/operations/ScatterChart.mjs b/src/core/operations/ScatterChart.mjs
index 6898a91e..fa642449 100644
--- a/src/core/operations/ScatterChart.mjs
+++ b/src/core/operations/ScatterChart.mjs
@@ -24,8 +24,8 @@ class ScatterChart extends Operation {
 
         this.name = "Scatter chart";
         this.module = "Charts";
-        this.description = "";
-        this.infoURL = "";
+        this.description = "Plots two-variable data as single points on a graph.";
+        this.infoURL = "https://en.wikipedia.org/wiki/Scatter_plot";
         this.inputType = "string";
         this.outputType = "html";
         this.args = [
@@ -73,6 +73,8 @@ class ScatterChart extends Operation {
     }
 
     /**
+     * Scatter chart operation.
+     *
      * @param {string} input
      * @param {Object[]} args
      * @returns {html}
diff --git a/src/core/operations/SeriesChart.mjs b/src/core/operations/SeriesChart.mjs
index 548aa7f2..bccbc7ed 100644
--- a/src/core/operations/SeriesChart.mjs
+++ b/src/core/operations/SeriesChart.mjs
@@ -24,8 +24,7 @@ class SeriesChart extends Operation {
 
         this.name = "Series chart";
         this.module = "Charts";
-        this.description = "";
-        this.infoURL = "";
+        this.description = "A time series graph is a line graph of repeated measurements taken over regular time intervals.";
         this.inputType = "string";
         this.outputType = "html";
         this.args = [
@@ -58,6 +57,8 @@ class SeriesChart extends Operation {
     }
 
     /**
+     * Series chart operation.
+     *
      * @param {string} input
      * @param {Object[]} args
      * @returns {html}