diff --git a/docs/2_worker_tricks/HowTo_atomicCounter.md b/docs/2_worker_tricks/HowTo_atomicCounter.md
index 21d562f..105abd7 100644
--- a/docs/2_worker_tricks/HowTo_atomicCounter.md
+++ b/docs/2_worker_tricks/HowTo_atomicCounter.md
@@ -1,5 +1,9 @@
 # HowTo: make an atomic counter using `countapi.xyz`?
 
+This API allows you to create simple numeric counters. Each counter is identified inside a `namespace` with a `key`. 
+
+Keys and namespaces must have at least 3 characters and less or equal to 64. Keys and namespaces must match: **`^[A-Za-z0-9_\-.]{3,64}`** pattern.
+
 ## Prepare yourself 1: make a 64 char long private key
 
 To create a unique key, for yourself, on your super safe computer, 
@@ -21,12 +25,19 @@ Keep the KEY (and possibly also the DOMAIN) a secret.
 
 To make a counter on `countapi.xyz`, replace namespace and key with your own values (demo values are `example.com` and `dvAV77q6uaIOSzE_cgq6Bs_q-vojyIglNLW8lWHtiGUuWM03mLCZnaWIqTtlWYhk`).
 
+Use `/create?<namespace>&<key>` to make new counter.
+Specify initial settings by adding optional params
+* `value` The initial value stored.
+* `enable_reset` Allows the key to be resetted with /set.
+* `update_lowerbound` Restrict update to not subtract more than this number. This number must be negative or zero.
+* `update_upperbound` Restrict update to not add more than this number. This number must be positive or zero.
+
 `https://api.countapi.xyz/create?namespace=example.com&key=dvAV77q6uaIOSzE_cgq6Bs_q-vojyIglNLW8lWHtiGUuWM03mLCZnaWIqTtlWYhk&update_lowerbound=0&update_upperbound=1&value=64`
 
-Check your counter by looking at its info on countapi.xyz:
+Check your counter by looking at its info on countapi.xyz using `/info/<namespace>/<key>`:
 `https://api.countapi.xyz/info/example.com/dvAV77q6uaIOSzE_cgq6Bs_q-vojyIglNLW8lWHtiGUuWM03mLCZnaWIqTtlWYhk`
 
-You can use the counter by calling:
+You can use the counter by calling `/hit/<namespace>/<key>`:
 `https://api.countapi.xyz/hit/example.com/dvAV77q6uaIOSzE_cgq6Bs_q-vojyIglNLW8lWHtiGUuWM03mLCZnaWIqTtlWYhk`
 
 The countapi.xyz returns json data.
@@ -62,4 +73,4 @@ addEventListener('fetch', e=>e.respondWith(handleRequest(e.request)));
 
 ## References
 
-* [countapi.xyz](https://countapi.xyz)
\ No newline at end of file
+* [countapi.xyz](https://countapi.xyz)