diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f7e9b98..a5940dba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unversioned
 
+- Minor: Added `is:first-msg` search option. (#3700)
 - Minor: Added quotation marks in the permitted/blocked Automod messages for clarity. (#3654)
 - Minor: Adjust large stream thumbnail to 16:9 (#3655)
 - Minor: Fixed being unable to load Twitch Usercards from the `/mentions` tab. (#3623)
diff --git a/src/messages/search/MessageFlagsPredicate.cpp b/src/messages/search/MessageFlagsPredicate.cpp
index da8ed64c..a1d2cbee 100644
--- a/src/messages/search/MessageFlagsPredicate.cpp
+++ b/src/messages/search/MessageFlagsPredicate.cpp
@@ -28,6 +28,10 @@ MessageFlagsPredicate::MessageFlagsPredicate(const QString &flags)
         {
             this->flags_.set(MessageFlag::System);
         }
+        else if (flag == "first-msg")
+        {
+            this->flags_.set(MessageFlag::FirstMessage);
+        }
     }
 }