diff --git a/js/controllers/autoanimate.js b/js/controllers/autoanimate.js
index 4e72e925..24eba329 100644
--- a/js/controllers/autoanimate.js
+++ b/js/controllers/autoanimate.js
@@ -461,7 +461,7 @@ export default class AutoAnimate {
 		const textNodes = 'h1, h2, h3, h4, h5, h6, p, li';
 		const mediaNodes = 'img, video, iframe';
 
-		// Eplicit matches via data-id
+		// Explicit matches via data-id
 		this.findAutoAnimateMatches( pairs, fromSlide, toSlide, '[data-id]', node => {
 			return node.nodeName + ':::' + node.getAttribute( 'data-id' );
 		} );
@@ -573,14 +573,14 @@ export default class AutoAnimate {
 
 			// Retrieve the 'from' element
 			if( fromMatches[key] ) {
-				const pimaryIndex = toMatches[key].length - 1;
+				const primaryIndex = toMatches[key].length - 1;
 				const secondaryIndex = fromMatches[key].length - 1;
 
 				// If there are multiple identical from elements, retrieve
 				// the one at the same index as our to-element.
-				if( fromMatches[key][ pimaryIndex ] ) {
-					fromElement = fromMatches[key][ pimaryIndex ];
-					fromMatches[key][ pimaryIndex ] = null;
+				if( fromMatches[key][ primaryIndex ] ) {
+					fromElement = fromMatches[key][ primaryIndex ];
+					fromMatches[key][ primaryIndex ] = null;
 				}
 				// If there are no matching from-elements at the same index,
 				// use the last one.
@@ -608,7 +608,7 @@ export default class AutoAnimate {
 	 * fading of unmatched elements is turned on, these elements
 	 * will fade when going between auto-animate slides.
 	 *
-	 * Note that parents of auto-animate targets are NOT considerd
+	 * Note that parents of auto-animate targets are NOT considered
 	 * unmatched since fading them would break the auto-animation.
 	 *
 	 * @param {HTMLElement} rootElement
diff --git a/js/controllers/jumptoslide.js b/js/controllers/jumptoslide.js
index 904b4479..cf2de99e 100644
--- a/js/controllers/jumptoslide.js
+++ b/js/controllers/jumptoslide.js
@@ -1,5 +1,5 @@
 /**
- * Makes it possble to jump to a slide by entering its
+ * Makes it possible to jump to a slide by entering its
  * slide number or id.
  */
 export default class JumpToSlide {
diff --git a/js/controllers/location.js b/js/controllers/location.js
index 811020b6..6fa48292 100644
--- a/js/controllers/location.js
+++ b/js/controllers/location.js
@@ -139,7 +139,7 @@ export default class Location {
 			let hash = this.getHash();
 
 			// If we're configured to push to history OR the history
-			// API is not avaialble.
+			// API is not available.
 			if( config.history ) {
 				window.location.hash = hash;
 			}
diff --git a/js/controllers/plugins.js b/js/controllers/plugins.js
index bc97918d..88f57bfb 100644
--- a/js/controllers/plugins.js
+++ b/js/controllers/plugins.js
@@ -12,7 +12,7 @@ export default class Plugins {
 		// Flags our current state (idle -> loading -> loaded)
 		this.state = 'idle';
 
-		// An id:instance map of currently registed plugins
+		// An id:instance map of currently registered plugins
 		this.registeredPlugins = {};
 
 		this.asyncDependencies = [];
@@ -171,7 +171,7 @@ export default class Plugins {
 	/**
 	 * Registers a new plugin with this reveal.js instance.
 	 *
-	 * reveal.js waits for all regisered plugins to initialize
+	 * reveal.js waits for all registered plugins to initialize
 	 * before considering itself ready, as long as the plugin
 	 * is registered before calling `Reveal.initialize()`.
 	 */
diff --git a/js/reveal.js b/js/reveal.js
index 8ff784fa..50e17d6b 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1251,7 +1251,7 @@ export default function( revealElement, options ) {
 	 */
 	function slide( h, v, f, origin ) {
 
-		// Dispatch an event before hte slide
+		// Dispatch an event before the slide
 		const slidechange = dispatchEvent({
 			type: 'beforeslidechange',
 			data: {
@@ -1852,7 +1852,7 @@ export default function( revealElement, options ) {
 		}
 
 		// If includeFragments is set, a route will be considered
-		// availalbe if either a slid OR fragment is available in
+		// available if either a slid OR fragment is available in
 		// the given direction
 		if( includeFragments === true ) {
 			let fragmentRoutes = fragments.availableRoutes();