diff --git a/src/impl/locale.js b/src/impl/locale.js
index cd55b3bfc..93c489b07 100644
--- a/src/impl/locale.js
+++ b/src/impl/locale.js
@@ -340,7 +340,7 @@ export default class Locale {
 
   static create(locale, numberingSystem, outputCalendar, weekSettings, defaultToEN = false) {
     const specifiedLocale = locale || Settings.defaultLocale;
-    // the system locale is useful for human readable strings but annoying for parsing/formatting known formats
+    // the system locale is useful for human-readable strings but annoying for parsing/formatting known formats
     const localeR = specifiedLocale || (defaultToEN ? "en-US" : systemLocale());
     const numberingSystemR = numberingSystem || Settings.defaultNumberingSystem;
     const outputCalendarR = outputCalendar || Settings.defaultOutputCalendar;
diff --git a/src/impl/util.js b/src/impl/util.js
index 405192444..a9b548c3c 100644
--- a/src/impl/util.js
+++ b/src/impl/util.js
@@ -287,6 +287,13 @@ export function normalizeObject(obj, normalizer) {
   return normalized;
 }
 
+/**
+ * Returns the offset's value as a string
+ * @param {number} ts - Epoch milliseconds for which to get the offset
+ * @param {string} format - What style of offset to return.
+ *                          Accepts 'narrow', 'short', or 'techie'. Returning '+6', '+06:00', or '+0600' respectively
+ * @return {string}
+ */
 export function formatOffset(offset, format) {
   const hours = Math.trunc(Math.abs(offset / 60)),
     minutes = Math.trunc(Math.abs(offset % 60)),
diff --git a/src/zone.js b/src/zone.js
index cec0e4fd1..f91a02ee7 100644
--- a/src/zone.js
+++ b/src/zone.js
@@ -22,6 +22,12 @@ export default class Zone {
     throw new ZoneIsAbstractError();
   }
 
+  /**
+   * The IANA name of this zone.
+   * Defaults to `name` if not overwritten by a subclass.
+   * @abstract
+   * @type {string}
+   */
   get ianaName() {
     return this.name;
   }
diff --git a/src/zones/IANAZone.js b/src/zones/IANAZone.js
index ad5945132..ae66f45a4 100644
--- a/src/zones/IANAZone.js
+++ b/src/zones/IANAZone.js
@@ -83,7 +83,7 @@ export default class IANAZone extends Zone {
    * @param {string} s - The string to check validity on
    * @example IANAZone.isValidSpecifier("America/New_York") //=> true
    * @example IANAZone.isValidSpecifier("Sport~~blorp") //=> false
-   * @deprecated This method returns false for some valid IANA names. Use isValidZone instead.
+   * @deprecated For backward compatibility, this forwards to isValidZone, better use `isValidZone()` directly instead.
    * @return {boolean}
    */
   static isValidSpecifier(s) {
@@ -118,32 +118,65 @@ export default class IANAZone extends Zone {
     this.valid = IANAZone.isValidZone(name);
   }
 
-  /** @override **/
+  /**
+   * The type of zone. `iana` for all instances of `IANAZone`.
+   * @override
+   * @type {string}
+   */
   get type() {
     return "iana";
   }
 
-  /** @override **/
+  /**
+   * The name of this zone (i.e. the IANA zone name).
+   * @override
+   * @type {string}
+   */
   get name() {
     return this.zoneName;
   }
 
-  /** @override **/
+  /**
+   * Returns whether the offset is known to be fixed for the whole year:
+   * Always returns false for all IANA zones.
+   * @override
+   * @type {boolean}
+   */
   get isUniversal() {
     return false;
   }
 
-  /** @override **/
+  /**
+   * Returns the offset's common name (such as EST) at the specified timestamp
+   * @override
+   * @param {number} ts - Epoch milliseconds for which to get the name
+   * @param {Object} opts - Options to affect the format
+   * @param {string} opts.format - What style of offset to return. Accepts 'long' or 'short'.
+   * @param {string} opts.locale - What locale to return the offset name in.
+   * @return {string}
+   */
   offsetName(ts, { format, locale }) {
     return parseZoneInfo(ts, format, locale, this.name);
   }
 
-  /** @override **/
+  /**
+   * Returns the offset's value as a string
+   * @override
+   * @param {number} ts - Epoch milliseconds for which to get the offset
+   * @param {string} format - What style of offset to return.
+   *                          Accepts 'narrow', 'short', or 'techie'. Returning '+6', '+06:00', or '+0600' respectively
+   * @return {string}
+   */
   formatOffset(ts, format) {
     return formatOffset(this.offset(ts), format);
   }
 
-  /** @override **/
+  /**
+   * Return the offset in minutes for this zone at the specified timestamp.
+   * @override
+   * @param {number} ts - Epoch milliseconds for which to compute the offset
+   * @return {number}
+   */
   offset(ts) {
     const date = new Date(ts);
 
@@ -177,12 +210,21 @@ export default class IANAZone extends Zone {
     return (asUTC - asTS) / (60 * 1000);
   }
 
-  /** @override **/
+  /**
+   * Return whether this Zone is equal to another zone
+   * @override
+   * @param {Zone} otherZone - the zone to compare
+   * @return {boolean}
+   */
   equals(otherZone) {
     return otherZone.type === "iana" && otherZone.name === this.name;
   }
 
-  /** @override **/
+  /**
+   * Return whether this Zone is valid.
+   * @override
+   * @type {boolean}
+   */
   get isValid() {
     return this.valid;
   }
diff --git a/src/zones/fixedOffsetZone.js b/src/zones/fixedOffsetZone.js
index dcfa25a1d..b1ab4ab1d 100644
--- a/src/zones/fixedOffsetZone.js
+++ b/src/zones/fixedOffsetZone.js
@@ -52,16 +52,31 @@ export default class FixedOffsetZone extends Zone {
     this.fixed = offset;
   }
 
-  /** @override **/
+  /**
+   * The type of zone. `fixed` for all instances of `FixedOffsetZone`.
+   * @override
+   * @type {string}
+   */
   get type() {
     return "fixed";
   }
 
-  /** @override **/
+  /**
+   * The name of this zone.
+   * All fixed zones' names always start with "UTC" (plus optional offset)
+   * @override
+   * @type {string}
+   */
   get name() {
     return this.fixed === 0 ? "UTC" : `UTC${formatOffset(this.fixed, "narrow")}`;
   }
 
+  /**
+   * The IANA name of this zone, i.e. `Etc/UTC` or `Etc/GMT+/-nn`
+   *
+   * @override
+   * @type {string}
+   */
   get ianaName() {
     if (this.fixed === 0) {
       return "Etc/UTC";
@@ -70,32 +85,65 @@ export default class FixedOffsetZone extends Zone {
     }
   }
 
-  /** @override **/
+  /**
+   * Returns the offset's common name at the specified timestamp.
+   *
+   * For fixed offset zones this equals to the zone name.
+   * @override
+   */
   offsetName() {
     return this.name;
   }
 
-  /** @override **/
+  /**
+   * Returns the offset's value as a string
+   * @override
+   * @param {number} ts - Epoch milliseconds for which to get the offset
+   * @param {string} format - What style of offset to return.
+   *                          Accepts 'narrow', 'short', or 'techie'. Returning '+6', '+06:00', or '+0600' respectively
+   * @return {string}
+   */
   formatOffset(ts, format) {
     return formatOffset(this.fixed, format);
   }
 
-  /** @override **/
+  /**
+   * Returns whether the offset is known to be fixed for the whole year:
+   * Always returns true for all fixed offset zones.
+   * @override
+   * @type {boolean}
+   */
   get isUniversal() {
     return true;
   }
 
-  /** @override **/
+  /**
+   * Return the offset in minutes for this zone at the specified timestamp.
+   *
+   * For fixed offset zones, this is constant and does not depend on a timestamp.
+   * @override
+   * @return {number}
+   */
   offset() {
     return this.fixed;
   }
 
-  /** @override **/
+  /**
+   * Return whether this Zone is equal to another zone (i.e. also fixed and same offset)
+   * @override
+   * @param {Zone} otherZone - the zone to compare
+   * @return {boolean}
+   */
   equals(otherZone) {
     return otherZone.type === "fixed" && otherZone.fixed === this.fixed;
   }
 
-  /** @override **/
+  /**
+   * Return whether this Zone is valid:
+   * All fixed offset zones are valid.
+   * @override
+   * @type {boolean}
+   */
   get isValid() {
     return true;
   }