diff --git a/browser/locales/en-US/chrome/browser/devtools/performance.dtd b/browser/locales/en-US/chrome/browser/devtools/performance.dtd
index 5d08db919b9..56b2202c3f9 100644
--- a/browser/locales/en-US/chrome/browser/devtools/performance.dtd
+++ b/browser/locales/en-US/chrome/browser/devtools/performance.dtd
@@ -51,7 +51,7 @@
 <!ENTITY performanceUI.exportButton "Save">
 
 <!-- LOCALIZATION NOTE (performanceUI.clearButton): This string is displayed
-  -  on a button that remvoes all the recordings. -->
+  -  on a button that removes all the recordings. -->
 <!ENTITY performanceUI.clearButton "Clear">
 
 <!-- LOCALIZATION NOTE (performanceUI.toolbar.*): These strings are displayed
diff --git a/browser/locales/en-US/chrome/browser/devtools/performance.properties b/browser/locales/en-US/chrome/browser/devtools/performance.properties
index 8cd7a7040ec..66857fffc1d 100644
--- a/browser/locales/en-US/chrome/browser/devtools/performance.properties
+++ b/browser/locales/en-US/chrome/browser/devtools/performance.properties
@@ -36,7 +36,8 @@ noRecordingsText=There are no profiles yet.
 
 # LOCALIZATION NOTE (recordingsList.itemLabel):
 # This string is displayed in the recordings list of the Performance Tools,
-# identifying a set of function calls.
+# identifying a set of function calls. %S represents the number of recording,
+# iterating for every new recording, resulting in "Recording #1", "Recording #2", etc.
 recordingsList.itemLabel=Recording #%S
 
 # LOCALIZATION NOTE (recordingsList.recordingLabel):