diff --git a/.eslintrc.js b/.eslintrc.js
index 2a2c14f68..bfe92311d 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -21,6 +21,7 @@ module.exports = {
 
   plugins: [
     'react',
+    'jsdoc',
     'jsx-a11y',
     'import',
     'promise',
@@ -270,5 +271,23 @@ module.exports = {
       },
       parser: '@typescript-eslint/parser',
     },
+    {
+      // Only enforce JSDoc comments on UI components for now.
+      // https://www.npmjs.com/package/eslint-plugin-jsdoc
+      files: ['app/soapbox/components/ui/**/*'],
+      rules: {
+        'jsdoc/require-jsdoc': ['error', {
+          publicOnly: true,
+          require: {
+            ArrowFunctionExpression: true,
+            ClassDeclaration: true,
+            ClassExpression: true,
+            FunctionDeclaration: true,
+            FunctionExpression: true,
+            MethodDefinition: true,
+          },
+        }],
+      },
+    },
   ],
 };
diff --git a/app/soapbox/components/ui/button/useButtonStyles.ts b/app/soapbox/components/ui/button/useButtonStyles.ts
index b6ba9fb71..1b52e9a05 100644
--- a/app/soapbox/components/ui/button/useButtonStyles.ts
+++ b/app/soapbox/components/ui/button/useButtonStyles.ts
@@ -10,6 +10,7 @@ type IButtonStyles = {
   size: ButtonSizes
 }
 
+/** Provides class names for the <Button> component. */
 const useButtonStyles = ({
   theme,
   block,
diff --git a/app/soapbox/components/ui/progress-bar/progress-bar.tsx b/app/soapbox/components/ui/progress-bar/progress-bar.tsx
index 165d73405..a4fcd84c9 100644
--- a/app/soapbox/components/ui/progress-bar/progress-bar.tsx
+++ b/app/soapbox/components/ui/progress-bar/progress-bar.tsx
@@ -4,6 +4,7 @@ interface IProgressBar {
   progress: number,
 }
 
+/** A horizontal meter filled to the given percentage. */
 const ProgressBar: React.FC<IProgressBar> = ({ progress }) => (
   <div className='h-2.5 w-full rounded-full bg-gray-100 dark:bg-slate-900/50 overflow-hidden'>
     <div className='h-full bg-accent-500' style={{ width: `${Math.floor(progress * 100)}%` }} />
diff --git a/package.json b/package.json
index 5d19be83b..6747d5a61 100644
--- a/package.json
+++ b/package.json
@@ -210,6 +210,7 @@
     "cross-env": "^7.0.3",
     "eslint": "^7.0.0",
     "eslint-plugin-import": "^2.25.4",
+    "eslint-plugin-jsdoc": "^39.2.9",
     "eslint-plugin-jsx-a11y": "^6.4.1",
     "eslint-plugin-promise": "^5.1.0",
     "eslint-plugin-react": "^7.25.1",
diff --git a/yarn.lock b/yarn.lock
index 9445a64a8..ab23759cf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1240,6 +1240,15 @@
   resolved "https://registry.yarnpkg.com/@discoveryjs/json-ext/-/json-ext-0.5.5.tgz#9283c9ce5b289a3c4f61c12757469e59377f81f3"
   integrity sha512-6nFkfkmSeV/rqSaS4oWHgmpnYw194f6hmWF5is6b0J1naJZoiD0NTc9AiUwPHvWsowkjuHErCZT1wa0jg+BLIA==
 
+"@es-joy/jsdoccomment@~0.29.0":
+  version "0.29.0"
+  resolved "https://registry.yarnpkg.com/@es-joy/jsdoccomment/-/jsdoccomment-0.29.0.tgz#527c7eefadeaf5c5d0c3b2721b5fa425d2119e98"
+  integrity sha512-4yKy5t+/joLihG+ei6CCU6sc08sjUdEdXCQ2U+9h9VP13EiqHQ4YMgDC18ys/AsLdJDBX3KRx/AWY6PR7hn52Q==
+  dependencies:
+    comment-parser "1.3.1"
+    esquery "^1.4.0"
+    jsdoc-type-pratt-parser "~3.0.1"
+
 "@eslint/eslintrc@^0.4.3":
   version "0.4.3"
   resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-0.4.3.tgz#9e42981ef035beb3dd49add17acb96e8ff6f394c"
@@ -3654,6 +3663,11 @@ commander@^7.0.0, commander@^7.2.0:
   resolved "https://registry.yarnpkg.com/commander/-/commander-7.2.0.tgz#a36cb57d0b501ce108e4d20559a150a391d97ab7"
   integrity sha512-QrWXB+ZQSVPmIWIhtEO9H+gwHaMGYiF5ChvoJ+K9ZGHG/sVsa6yiesAD1GC/x46sET00Xlwo1u49RVVVzvcSkw==
 
+comment-parser@1.3.1:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/comment-parser/-/comment-parser-1.3.1.tgz#3d7ea3adaf9345594aedee6563f422348f165c1b"
+  integrity sha512-B52sN2VNghyq5ofvUsqZjmk6YkihBX5vMSChmSK9v4ShjKf3Vk5Xcmgpw4o+iIgtrnM/u5FiMpz9VKb8lpBveA==
+
 commondir@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/commondir/-/commondir-1.0.1.tgz#ddd800da0c66127393cca5950ea968a3aaf1253b"
@@ -4094,7 +4108,7 @@ debug@^3.1.1, debug@^3.2.7:
   dependencies:
     ms "^2.1.1"
 
-debug@^4.1.0, debug@^4.3.2:
+debug@^4.1.0, debug@^4.3.2, debug@^4.3.4:
   version "4.3.4"
   resolved "https://registry.yarnpkg.com/debug/-/debug-4.3.4.tgz#1319f6579357f2338d3337d2cdd4914bb5dcc865"
   integrity sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==
@@ -4698,6 +4712,19 @@ eslint-plugin-import@^2.25.4:
     resolve "^1.20.0"
     tsconfig-paths "^3.12.0"
 
+eslint-plugin-jsdoc@^39.2.9:
+  version "39.2.9"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-39.2.9.tgz#bc351de403f1862f1ef8c440d12dedc28e74cbbb"
+  integrity sha512-gaPYJT94rWlWyQcisQyyEJHtLaaJqN4baFlLCEr/LcXVibS9wzQTL2dskqk327ggwqQopR+Xecu2Lng1IJ9Ypw==
+  dependencies:
+    "@es-joy/jsdoccomment" "~0.29.0"
+    comment-parser "1.3.1"
+    debug "^4.3.4"
+    escape-string-regexp "^4.0.0"
+    esquery "^1.4.0"
+    semver "^7.3.7"
+    spdx-expression-parse "^3.0.1"
+
 eslint-plugin-jsx-a11y@^6.4.1:
   version "6.4.1"
   resolved "https://registry.yarnpkg.com/eslint-plugin-jsx-a11y/-/eslint-plugin-jsx-a11y-6.4.1.tgz#a2d84caa49756942f42f1ffab9002436391718fd"
@@ -6760,6 +6787,11 @@ js2xmlparser@^4.0.1:
   dependencies:
     xmlcreate "^2.0.3"
 
+jsdoc-type-pratt-parser@~3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/jsdoc-type-pratt-parser/-/jsdoc-type-pratt-parser-3.0.1.tgz#ccbc7a4180bc8748af64d2cc431aaa92f88175bb"
+  integrity sha512-vqMCdAFVIiFhVgBYE/X8naf3L/7qiJsaYWTfUJZZZ124dR3OUz9HrmaMUGpYIYAN4VSuodf6gIZY0e8ktPw9cg==
+
 jsdoc@~3.6.7:
   version "3.6.7"
   resolved "https://registry.yarnpkg.com/jsdoc/-/jsdoc-3.6.7.tgz#00431e376bed7f9de4716c6f15caa80e64492b89"
@@ -9581,6 +9613,13 @@ semver@^6.0.0, semver@^6.1.1, semver@^6.1.2, semver@^6.3.0:
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
   integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
 
+semver@^7.3.7:
+  version "7.3.7"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.7.tgz#12c5b649afdbf9049707796e22a4028814ce523f"
+  integrity sha512-QlYTucUYOews+WeEujDoEGziz4K6c47V/Bd+LjSSYcA94p+DmINdf7ncaUinThfvZyu13lN9OY1XDxt8C0Tw0g==
+  dependencies:
+    lru-cache "^6.0.0"
+
 send@0.17.1:
   version "0.17.1"
   resolved "https://registry.yarnpkg.com/send/-/send-0.17.1.tgz#c1d8b059f7900f7466dd4938bdc44e11ddb376c8"
@@ -9800,7 +9839,7 @@ spdx-exceptions@^2.1.0:
   resolved "https://registry.yarnpkg.com/spdx-exceptions/-/spdx-exceptions-2.3.0.tgz#3f28ce1a77a00372683eade4a433183527a2163d"
   integrity sha512-/tTrYOC7PPI1nUAgx34hUpqXuyJG+DTHJTnIULG4rDygi4xu/tfgmq1e1cIRwRzwZgo4NLySi+ricLkZkw4i5A==
 
-spdx-expression-parse@^3.0.0:
+spdx-expression-parse@^3.0.0, spdx-expression-parse@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/spdx-expression-parse/-/spdx-expression-parse-3.0.1.tgz#cf70f50482eefdc98e3ce0a6833e4a53ceeba679"
   integrity sha512-cbqHunsQWnJNE6KhVSMsMeH5H/L9EpymbzqTQ3uLwNCLZ1Q481oWaofqH7nO6V07xlXwY6PhQdQ2IedWx/ZK4Q==