diff --git a/writeas/AppDelegate.swift b/writeas/AppDelegate.swift
index 1fba032..b2d68b1 100644
--- a/writeas/AppDelegate.swift
+++ b/writeas/AppDelegate.swift
@@ -85,6 +85,11 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         UserDefaults.standard.set(String(sender.state), forKey: "night_mode_state")
     }
 
+    @IBAction func formatStrong(_ sender: Any) {
+        let wc = NSApplication.shared().mainWindow?.windowController as? WindowController
+        wc?.embolden()
+    }
+
     @IBAction func setFontSerif(_ sender: NSMenuItem) {
         deselectAllFonts()
         sender.state = NSOnState
diff --git a/writeas/Base.lproj/Main.storyboard b/writeas/Base.lproj/Main.storyboard
index 6d410be..ec3c57b 100644
--- a/writeas/Base.lproj/Main.storyboard
+++ b/writeas/Base.lproj/Main.storyboard
@@ -322,6 +322,12 @@ DQ
                                                 </items>
                                             </menu>
                                         </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="A2K-0R-RPV"/>
+                                        <menuItem title="Strong" keyEquivalent="b" id="iGK-Hg-zxc">
+                                            <connections>
+                                                <action selector="formatStrong:" target="Voe-Tx-rLC" id="Cpe-8G-6Yo"/>
+                                            </connections>
+                                        </menuItem>
                                     </items>
                                 </menu>
                             </menuItem>
diff --git a/writeas/ViewController.swift b/writeas/ViewController.swift
index 9012988..a4329e1 100644
--- a/writeas/ViewController.swift
+++ b/writeas/ViewController.swift
@@ -86,6 +86,19 @@ class ViewController: NSViewController, NSTextViewDelegate, NSUserNotificationCe
         }
     }
 
+    func embolden() {
+        let selectedRange = writerText.selectedRange()
+        let selString = (self.writerText.textStorage?.string as! NSString).substring(with: selectedRange)
+        let repString = "**\(selString)**"
+        if self.writerText.shouldChangeText(in: selectedRange, replacementString: repString) {
+            self.writerText.replaceCharacters(in: NSRange(location: selectedRange.location, length: selectedRange.length), with: repString)
+            self.writerText.didChangeText()
+            if selString == "" {
+                writerText.setSelectedRange(NSRange(location: selectedRange.location + 2, length: 0))
+            }
+        }
+    }
+
     func publish() {
         saveDocument()
 
diff --git a/writeas/WindowController.swift b/writeas/WindowController.swift
index ee79ee5..2408f66 100644
--- a/writeas/WindowController.swift
+++ b/writeas/WindowController.swift
@@ -27,4 +27,8 @@ class WindowController: NSWindowController {
     func toggle(isNight: Bool) {
         vc?.toggle(isNight: isNight)
     }
+
+    func embolden() {
+        vc?.embolden()
+    }
 }