diff --git a/locales/index.d.ts b/locales/index.d.ts
index df6efe0d6a..f062dfe6e3 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -13053,6 +13053,10 @@ export interface Locale extends ILocale {
      * Timeout in milliseconds for translation API requests.
      */
     "translationTimeoutCaption": string;
+    /**
+     * Except for regular expressions, all word mutes are *case-sensitive* and match on any substring, including part of a longer word or name.
+     */
+    "wordMuteWarning": string;
 }
 declare const locales: {
     [lang: string]: Locale;
diff --git a/packages/frontend/src/pages/settings/mute-block.vue b/packages/frontend/src/pages/settings/mute-block.vue
index 257ed3edd8..8cc3945df8 100644
--- a/packages/frontend/src/pages/settings/mute-block.vue
+++ b/packages/frontend/src/pages/settings/mute-block.vue
@@ -22,6 +22,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<div class="_gaps_m">
 						<MkInfo>{{ i18n.ts.wordMuteDescription }}</MkInfo>
 
+						<MkInfo warn>{{ i18n.ts.wordMuteWarning }}</MkInfo>
+
 						<SearchMarker
 							:label="i18n.ts.showMutedWord"
 							:keywords="['show']"
@@ -44,6 +46,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 					<div class="_gaps_m">
 						<MkInfo>{{ i18n.ts.hardWordMuteDescription }}</MkInfo>
+
+						<MkInfo warn>{{ i18n.ts.wordMuteWarning }}</MkInfo>
+
 						<XWordMute :muted="$i.hardMutedWords" @save="saveHardMutedWords"/>
 					</div>
 				</MkFolder>
diff --git a/sharkey-locales/en-US.yml b/sharkey-locales/en-US.yml
index 93e178c636..b9ec49753a 100644
--- a/sharkey-locales/en-US.yml
+++ b/sharkey-locales/en-US.yml
@@ -560,6 +560,7 @@ wordMuteTestTest: "Test"
 wordMuteTestMatch: "Matched words: {words}"
 wordMuteTestNoResults: "No results yet, enter some text and click \"Test\" to check it."
 wordMuteTestNoMatch: "Text does not match any patterns."
+wordMuteWarning: "Except for regular expressions, all word mutes are *case-sensitive* and match on any substring, including part of a longer word or name."
 
 bubbleTimeline: "Bubble timeline"
 bubbleTimelineDescription: "Choose which instances should be displayed in the bubble."