diff --git a/README.md b/README.md
index 9672ffa..fc1799e 100644
--- a/README.md
+++ b/README.md
@@ -214,7 +214,7 @@ uid           [ unknown] root <root@localhost>
 The fingerprint here is `9F89C5F69A10281A835014B09C3DC61F752087EF`.
 </details>
 
-Your `age` public key or GPG fingerprint can written to your [`.sops.yaml`](https://github.com/mozilla/sops#using-sops-YAML-conf-to-select-kms-pgp-for-new-files) in the root of your configuration directory or repository:
+Your `age` public key or GPG fingerprint can be written to your [`.sops.yaml`](https://github.com/mozilla/sops#using-sops-YAML-conf-to-select-kms-pgp-for-new-files) in the root of your configuration directory or repository:
 ```yaml
 # This example uses YAML anchors which allows reuse of multiple keys 
 # without having to repeat yourself.
@@ -224,7 +224,7 @@ keys:
   - &admin_alice 2504791468b153b8a3963cc97ba53d1919c5dfd4
   - &admin_bob age12zlz6lvcdk6eqaewfylg35w0syh58sm7gh53q5vvn7hd7c6nngyseftjxl
 creation_rules:
-  - path_regex: secrets/[^/]+\.yaml$
+  - path_regex: secrets/[^/]+\.(yaml|json|env|ini)$
     key_groups:
     - pgp:
       - *admin_alice
@@ -232,6 +232,11 @@ creation_rules:
       - *admin_bob
 ```
 
+**Note:** be sure to not include a `-` before subsequent key types under `key_groups`
+(i.e. `age` in the above example should not have a `-` in front). If you do, `sops`
+will produce [a vague error](https://github.com/getsops/sops/issues/857) when
+encrypting files.
+
 </details>
 
 <details>
@@ -268,7 +273,7 @@ keys:
   - &server_azmidi 0fd60c8c3b664aceb1796ce02b318df330331003
   - &server_nosaxa age1rgffpespcyjn0d8jglk7km9kfrfhdyev6camd3rck6pn8y47ze4sug23v3
 creation_rules:
-  - path_regex: secrets/[^/]+\.yaml$
+  - path_regex: secrets/[^/]+\.(yaml|json|env|ini)$
     key_groups:
     - pgp:
       - *admin_alice
@@ -276,7 +281,7 @@ creation_rules:
       age:
       - *admin_bob
       - *server_nosaxa
-  - path_regex: secrets/azmidi/[^/]+\.yaml$
+  - path_regex: secrets/azmidi/[^/]+\.(yaml|json|env|ini)$
     key_groups:
     - pgp:
       - *admin_alice