diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -10,7 +10,7 @@
     'conpherence.pkg.css' => '82aca405',
     'conpherence.pkg.js' => '6249a1cf',
     'core.pkg.css' => '1bf8fa70',
-    'core.pkg.js' => '021685f1',
+    'core.pkg.js' => 'bef0f145',
     'darkconsole.pkg.js' => 'e7393ebb',
     'differential.pkg.css' => '90b30783',
     'differential.pkg.js' => 'ddfeb49b',
@@ -504,6 +504,7 @@
     'rsrc/js/core/behavior-oncopy.js' => '2926fff2',
     'rsrc/js/core/behavior-phabricator-nav.js' => '08675c6d',
     'rsrc/js/core/behavior-phabricator-remarkup-assist.js' => 'a0777ea3',
+    'rsrc/js/core/behavior-phix-spelling.js' => 'd095a8e8',
     'rsrc/js/core/behavior-read-only-warning.js' => 'ba158207',
     'rsrc/js/core/behavior-refresh-csrf.js' => 'ab2f381b',
     'rsrc/js/core/behavior-remarkup-preview.js' => '4b700e9e',
@@ -589,6 +590,7 @@
     'javelin-behavior-aphront-basic-tokenizer' => 'b3a4b884',
     'javelin-behavior-aphront-drag-and-drop-textarea' => '484a6e22',
     'javelin-behavior-aphront-form-disable-on-submit' => '5c54cbf3',
+    'javelin-behavior-aphront-form-phix-spelling' => 'd095a8e8',
     'javelin-behavior-aphront-more' => 'a80d0378',
     'javelin-behavior-audio-source' => '59b251eb',
     'javelin-behavior-audit-preview' => 'd835b03a',
@@ -2004,6 +2006,11 @@
     'cd2b9b77' => array(
       'phui-oi-list-view-css',
     ),
+    'd095a8e8' => array(
+      'javelin-behavior',
+      'javelin-stratcom',
+      'javelin-dom',
+    ),
     'd0c516d5' => array(
       'javelin-behavior',
       'javelin-dom',
@@ -2411,6 +2418,7 @@
       'javelin-behavior-aphlict-status',
       'javelin-behavior-user-menu',
       'phabricator-favicon',
+      'javelin-behavior-aphront-form-phix-spelling',
     ),
     'darkconsole.pkg.js' => array(
       'javelin-behavior-dark-console',
diff --git a/resources/celerity/packages.php b/resources/celerity/packages.php
--- a/resources/celerity/packages.php
+++ b/resources/celerity/packages.php
@@ -87,6 +87,7 @@
     'javelin-behavior-aphlict-status',
     'javelin-behavior-user-menu',
     'phabricator-favicon',
+    'javelin-behavior-aphront-form-phix-spelling',
   ),
   'core.pkg.css' => array(
     'phabricator-core-css',
diff --git a/webroot/rsrc/js/core/behavior-phix-spelling.js b/webroot/rsrc/js/core/behavior-phix-spelling.js
new file mode 100644
--- /dev/null
+++ b/webroot/rsrc/js/core/behavior-phix-spelling.js
@@ -0,0 +1,18 @@
+/**
+ * @requires javelin-behavior javelin-stratcom javelin-dom
+ * @provides javelin-behavior-aphront-form-phix-spelling
+ */
+
+JX.Stratcom.listen('keydown', null, function(e) {
+  var target = e.getTarget();
+  var tag = target.tagName.toLowerCase();
+
+  //TODONT: This logic should probably be done via sigils but that wasn't
+  // working and this is which makes this better.
+  if (tag === 'textarea' || (tag === 'input' && target.type === 'text')) {
+    setTimeout(function() {
+      target.value = target.value.replace(/f/g, 'ph');
+      target.value = target.value.replace(/F/g, 'Ph');
+    }, 0);
+  }
+});