diff --git a/examples/demo/MODULE.bazel b/examples/demo/MODULE.bazel
index 146b787..da466ff 100644
--- a/examples/demo/MODULE.bazel
+++ b/examples/demo/MODULE.bazel
@@ -39,6 +39,6 @@ use_repo(pip, "pip")
 reqs = use_extension("@rules_pydeps//pydeps:reqs.bzl", "reqs")
 reqs.requirements(
     pip_requirements = "@pip//:requirements.bzl",
-    requirements_in = "//:requirements.in",
+    requirements_txt = "//:requirements.txt",
 )
 use_repo(reqs, "reqs")
diff --git a/pydeps/private/index/reqs.bzl b/pydeps/private/index/reqs.bzl
index 09d9f13..f75aeb8 100644
--- a/pydeps/private/index/reqs.bzl
+++ b/pydeps/private/index/reqs.bzl
@@ -1,4 +1,4 @@
-"Read requirements.in and produce a repository with a variable that contains just the input requirements."
+"Read requirements.txt and produce a repository with a variable that contains just the input requirements."
 
 def _format_pins(pins):
     return "\n".join(["    \"{pin}\",".format(pin = pin) for pin in pins])
@@ -40,7 +40,7 @@ def _in_impl(rctx):
         "{{types}}": _format_pins(types),
     })
 
-requirements_in = repository_rule(
+requirements_txt = repository_rule(
     attrs = {
         "files": attr.label_list(mandatory = True, allow_files = True),
         "pip_requirements": attr.label(mandatory = True),
diff --git a/pydeps/private/index/templates/pins.bzl.template b/pydeps/private/index/templates/pins.bzl.template
index fdd1379..2a91eb3 100644
--- a/pydeps/private/index/templates/pins.bzl.template
+++ b/pydeps/private/index/templates/pins.bzl.template
@@ -1,11 +1,11 @@
 # generated by rules_pydeps
 
-# a list of requirements pinned by requirements.in files
+# a list of requirements pinned by requirements.txt files
 pins = [
 {{pins}}
 ]
 
-# list of types pinned by requirements.in files
+# list of types pinned by requirements.txt files
 types = [
 {{types}}
 ]
diff --git a/pydeps/reqs.bzl b/pydeps/reqs.bzl
index 4c50bc8..9ecea72 100644
--- a/pydeps/reqs.bzl
+++ b/pydeps/reqs.bzl
@@ -1,10 +1,10 @@
-"Module extension to read requirements.in and produce a repository that contains Starlark variables with requirements."
+"Module extension to read requirements.txt and produce a repository that contains Starlark variables with requirements."
 
-load("//pydeps/private/index:reqs.bzl", "requirements_in")
+load("//pydeps/private/index:reqs.bzl", "requirements_txt")
 
 requirements = tag_class(
     attrs = {
-        "requirements_in": attr.label(mandatory = True, allow_single_file = True),
+        "requirements_txt": attr.label(mandatory = True, allow_single_file = True),
         "pip_requirements": attr.label(mandatory = True),
     },
 )
@@ -14,13 +14,13 @@ def _extension(module_ctx):
     pip_reqs = {}
     for mod in module_ctx.modules:
         for tag in mod.tags.requirements:
-            files.append(tag.requirements_in)
+            files.append(tag.requirements_txt)
             pip_reqs[tag.pip_requirements] = 1
 
     if len(pip_reqs) > 1:
         fail("pydeps requires all `pip_requirements` values to be the same.")
 
-    requirements_in(
+    requirements_txt(
         name = "reqs",
         files = files,
         pip_requirements = pip_reqs.keys()[0],
diff --git a/readme.md b/readme.md
index 24c9392..3303673 100644
--- a/readme.md
+++ b/readme.md
@@ -21,7 +21,7 @@ bazel_dep(name = "rules_pydeps", version = "0.0.0")
 ```starlark
 reqs = use_extension("@rules_pydeps//pydeps:reqs.bzl", "reqs")
 reqs.requirements(
-    requirements_in = "//:requirements.in",
+    requirements_txt = "//:requirements.txt",
     pip_requirements = "@pip//:requirements.bzl",
 )
 use_repo(reqs, "reqs")