diff --git a/.flake8 b/.flake8
index 418b6b5..c2aa770 100644
--- a/.flake8
+++ b/.flake8
@@ -1,5 +1,4 @@
 [flake8]
 max-line-length = 120
-exclude =
-    .git,
+extend-exclude =
     migrations
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..4c87136
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,8 @@
+- repo: local
+  hooks:
+    - id: flake8
+      name: flake8
+      entry: flake8
+      language: system
+      files: ^.*\.py$
+      exclude: ^(migrations).*$
diff --git a/Pipfile b/Pipfile
index 3fbc6e4..2c4d443 100644
--- a/Pipfile
+++ b/Pipfile
@@ -15,6 +15,7 @@ pyyaml = "~=5.4.1"
 [dev-packages]
 flake8 = "~=3.9.2"
 yapf = "~=0.31.0"
+pre-commit = "~=2.13.0"
 
 [requires]
 python_version = "3.8"
diff --git a/Pipfile.lock b/Pipfile.lock
index 0b1ef91..135b693 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "439b60cb87b0180f0b78c531085f9bbeef7685ef038256f80b0a8123e7d144e6"
+            "sha256": "315632e3e0878039dcf4dfd73b8dc3f0285388bac45601cda9bca603b3a4ae18"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -298,6 +298,35 @@
         }
     },
     "develop": {
+        "appdirs": {
+            "hashes": [
+                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
+                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
+            ],
+            "version": "==1.4.4"
+        },
+        "cfgv": {
+            "hashes": [
+                "sha256:9e600479b3b99e8af981ecdfc80a0296104ee610cab48a5ae4ffd0b668650eb1",
+                "sha256:b449c9c6118fe8cca7fa5e00b9ec60ba08145d281d52164230a69211c5d597a1"
+            ],
+            "markers": "python_full_version >= '3.6.1'",
+            "version": "==3.3.0"
+        },
+        "distlib": {
+            "hashes": [
+                "sha256:106fef6dc37dd8c0e2c0a60d3fca3e77460a48907f335fa28420463a6f799736",
+                "sha256:23e223426b28491b1ced97dc3bbe183027419dfc7982b4fa2f05d5f3ff10711c"
+            ],
+            "version": "==0.3.2"
+        },
+        "filelock": {
+            "hashes": [
+                "sha256:18d82244ee114f543149c66a6e0c14e9c4f8a1044b5cdaadd0f82159d6a6ff59",
+                "sha256:929b7d63ec5b7d6b71b0fa5ac14e030b3f70b75747cef1b10da9b879fef15836"
+            ],
+            "version": "==3.0.12"
+        },
         "flake8": {
             "hashes": [
                 "sha256:07528381786f2a6237b061f6e96610a4167b226cb926e2aa2b6b1d78057c576b",
@@ -306,6 +335,14 @@
             "index": "pypi",
             "version": "==3.9.2"
         },
+        "identify": {
+            "hashes": [
+                "sha256:18d0c531ee3dbc112fa6181f34faa179de3f57ea57ae2899754f16a7e0ff6421",
+                "sha256:5b41f71471bc738e7b586308c3fca172f78940195cb3bf6734c1e66fdac49306"
+            ],
+            "markers": "python_full_version >= '3.6.1'",
+            "version": "==2.2.10"
+        },
         "mccabe": {
             "hashes": [
                 "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42",
@@ -313,6 +350,21 @@
             ],
             "version": "==0.6.1"
         },
+        "nodeenv": {
+            "hashes": [
+                "sha256:3ef13ff90291ba2a4a7a4ff9a979b63ffdd00a464dbe04acf0ea6471517a4c2b",
+                "sha256:621e6b7076565ddcacd2db0294c0381e01fd28945ab36bcf00f41c5daf63bef7"
+            ],
+            "version": "==1.6.0"
+        },
+        "pre-commit": {
+            "hashes": [
+                "sha256:764972c60693dc668ba8e86eb29654ec3144501310f7198742a767bec385a378",
+                "sha256:b679d0fddd5b9d6d98783ae5f10fd0c4c59954f375b70a58cbe1ce9bcf9809a4"
+            ],
+            "index": "pypi",
+            "version": "==2.13.0"
+        },
         "pycodestyle": {
             "hashes": [
                 "sha256:514f76d918fcc0b55c6680472f0a37970994e07bbb80725808c17089be302068",
@@ -328,6 +380,73 @@
             ],
             "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.3.1"
+        },
+        "pyyaml": {
+            "hashes": [
+                "sha256:08682f6b72c722394747bddaf0aa62277e02557c0fd1c42cb853016a38f8dedf",
+                "sha256:0f5f5786c0e09baddcd8b4b45f20a7b5d61a7e7e99846e3c799b05c7c53fa696",
+                "sha256:129def1b7c1bf22faffd67b8f3724645203b79d8f4cc81f674654d9902cb4393",
+                "sha256:294db365efa064d00b8d1ef65d8ea2c3426ac366c0c4368d930bf1c5fb497f77",
+                "sha256:3b2b1824fe7112845700f815ff6a489360226a5609b96ec2190a45e62a9fc922",
+                "sha256:3bd0e463264cf257d1ffd2e40223b197271046d09dadf73a0fe82b9c1fc385a5",
+                "sha256:4465124ef1b18d9ace298060f4eccc64b0850899ac4ac53294547536533800c8",
+                "sha256:49d4cdd9065b9b6e206d0595fee27a96b5dd22618e7520c33204a4a3239d5b10",
+                "sha256:4e0583d24c881e14342eaf4ec5fbc97f934b999a6828693a99157fde912540cc",
+                "sha256:5accb17103e43963b80e6f837831f38d314a0495500067cb25afab2e8d7a4018",
+                "sha256:607774cbba28732bfa802b54baa7484215f530991055bb562efbed5b2f20a45e",
+                "sha256:6c78645d400265a062508ae399b60b8c167bf003db364ecb26dcab2bda048253",
+                "sha256:72a01f726a9c7851ca9bfad6fd09ca4e090a023c00945ea05ba1638c09dc3347",
+                "sha256:74c1485f7707cf707a7aef42ef6322b8f97921bd89be2ab6317fd782c2d53183",
+                "sha256:895f61ef02e8fed38159bb70f7e100e00f471eae2bc838cd0f4ebb21e28f8541",
+                "sha256:8c1be557ee92a20f184922c7b6424e8ab6691788e6d86137c5d93c1a6ec1b8fb",
+                "sha256:bb4191dfc9306777bc594117aee052446b3fa88737cd13b7188d0e7aa8162185",
+                "sha256:bfb51918d4ff3d77c1c856a9699f8492c612cde32fd3bcd344af9be34999bfdc",
+                "sha256:c20cfa2d49991c8b4147af39859b167664f2ad4561704ee74c1de03318e898db",
+                "sha256:cb333c16912324fd5f769fff6bc5de372e9e7a202247b48870bc251ed40239aa",
+                "sha256:d2d9808ea7b4af864f35ea216be506ecec180628aced0704e34aca0b040ffe46",
+                "sha256:d483ad4e639292c90170eb6f7783ad19490e7a8defb3e46f97dfe4bacae89122",
+                "sha256:dd5de0646207f053eb0d6c74ae45ba98c3395a571a2891858e87df7c9b9bd51b",
+                "sha256:e1d4970ea66be07ae37a3c2e48b5ec63f7ba6804bdddfdbd3cfd954d25a82e63",
+                "sha256:e4fac90784481d221a8e4b1162afa7c47ed953be40d31ab4629ae917510051df",
+                "sha256:fa5ae20527d8e831e8230cbffd9f8fe952815b2b7dae6ffec25318803a7528fc",
+                "sha256:fd7f6999a8070df521b6384004ef42833b9bd62cfee11a09bda1079b4b704247",
+                "sha256:fdc842473cd33f45ff6bce46aea678a54e3d21f1b61a7750ce3c498eedfe25d6",
+                "sha256:fe69978f3f768926cfa37b867e3843918e012cf83f680806599ddce33c2c68b0"
+            ],
+            "index": "pypi",
+            "version": "==5.4.1"
+        },
+        "six": {
+            "hashes": [
+                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
+                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.16.0"
+        },
+        "toml": {
+            "hashes": [
+                "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b",
+                "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"
+            ],
+            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==0.10.2"
+        },
+        "virtualenv": {
+            "hashes": [
+                "sha256:14fdf849f80dbb29a4eb6caa9875d476ee2a5cf76a5f5415fa2f1606010ab467",
+                "sha256:2b0126166ea7c9c3661f5b8e06773d28f83322de7a3ff7d06f0aed18c9de6a76"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==20.4.7"
+        },
+        "yapf": {
+            "hashes": [
+                "sha256:408fb9a2b254c302f49db83c59f9aa0b4b0fd0ec25be3a5c51181327922ff63d",
+                "sha256:e3a234ba8455fe201eaa649cdac872d590089a18b661e39bbac7020978dd9c2e"
+            ],
+            "index": "pypi",
+            "version": "==0.31.0"
         }
     }
 }
diff --git a/README.md b/README.md
index 155198f..9481b38 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,16 @@ flask run
 http://localhost:5000/
 
 
+### pre-commit einrichten
+
+Damit mensch nicht verpeilt kaputten Code Style zu commiten,
+kann pre-commit benutzt werden. Einmal im Virtualenv ausführen:
+
+```
+pre-commit install
+```
+
+
 ### Tests ausführen
 
 ```