diff --git a/requirements/dev.txt b/requirements/dev.txt
index ae0021f4b8..9f557a36e9 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -1,7 +1,7 @@
 #
 # This file is GENERATED.  Don't edit directly.
 #
-# To update, edit the non-"lock" files in requirements/*.txt, then:
+# To update, edit the non-"lock" files in requirements/*.in, then:
 #
 #    tools/update-locked-requirements
 #
diff --git a/requirements/docs.txt b/requirements/docs.txt
index 8e189ed175..6fa6bc3dde 100644
--- a/requirements/docs.txt
+++ b/requirements/docs.txt
@@ -1,7 +1,7 @@
 #
 # This file is GENERATED.  Don't edit directly.
 #
-# To update, edit the non-"lock" files in requirements/*.txt, then:
+# To update, edit the non-"lock" files in requirements/*.in, then:
 #
 #    tools/update-locked-requirements
 #
diff --git a/requirements/mypy.txt b/requirements/mypy.txt
index 8df79c3419..4209d95213 100644
--- a/requirements/mypy.txt
+++ b/requirements/mypy.txt
@@ -1,7 +1,7 @@
 #
 # This file is GENERATED.  Don't edit directly.
 #
-# To update, edit the non-"lock" files in requirements/*.txt, then:
+# To update, edit the non-"lock" files in requirements/*.in, then:
 #
 #    tools/update-locked-requirements
 #
diff --git a/requirements/pip.txt b/requirements/pip.txt
index f36fd3a4ee..ed857e80f9 100644
--- a/requirements/pip.txt
+++ b/requirements/pip.txt
@@ -1,7 +1,7 @@
 #
 # This file is GENERATED.  Don't edit directly.
 #
-# To update, edit the non-"lock" files in requirements/*.txt, then:
+# To update, edit the non-"lock" files in requirements/*.in, then:
 #
 #    tools/update-locked-requirements
 #
diff --git a/requirements/prod.txt b/requirements/prod.txt
index ab2d648374..9865dec553 100644
--- a/requirements/prod.txt
+++ b/requirements/prod.txt
@@ -1,7 +1,7 @@
 #
 # This file is GENERATED.  Don't edit directly.
 #
-# To update, edit the non-"lock" files in requirements/*.txt, then:
+# To update, edit the non-"lock" files in requirements/*.in, then:
 #
 #    tools/update-locked-requirements
 #
diff --git a/requirements/thumbor-dev.txt b/requirements/thumbor-dev.txt
index 6280d1db2a..59788463c9 100644
--- a/requirements/thumbor-dev.txt
+++ b/requirements/thumbor-dev.txt
@@ -1,7 +1,7 @@
 #
 # This file is GENERATED.  Don't edit directly.
 #
-# To update, edit the non-"lock" files in requirements/*.txt, then:
+# To update, edit the non-"lock" files in requirements/*.in, then:
 #
 #    tools/update-locked-requirements
 #
diff --git a/requirements/thumbor.txt b/requirements/thumbor.txt
index 1b07aed9e8..4c1d947dae 100644
--- a/requirements/thumbor.txt
+++ b/requirements/thumbor.txt
@@ -1,7 +1,7 @@
 #
 # This file is GENERATED.  Don't edit directly.
 #
-# To update, edit the non-"lock" files in requirements/*.txt, then:
+# To update, edit the non-"lock" files in requirements/*.in, then:
 #
 #    tools/update-locked-requirements
 #
diff --git a/tools/update-locked-requirements b/tools/update-locked-requirements
index 93b6499646..1e8072bd1c 100755
--- a/tools/update-locked-requirements
+++ b/tools/update-locked-requirements
@@ -17,7 +17,7 @@ compile_requirements() {
 #
 # This file is GENERATED.  Don't edit directly.
 #
-# To update, edit the non-"lock" files in requirements/*.txt, then:
+# To update, edit the non-"lock" files in requirements/*.in, then:
 #
 #    tools/update-locked-requirements
 #