diff --git a/41.md b/41.md
index efab8ffd..4030d524 100644
--- a/41.md
+++ b/41.md
@@ -30,7 +30,8 @@ Clients need a simple, relay-indexable way to discover physical places (e.g., RV
 - `["address", "<street>", "<city>", "<region>", "<postal>", "<country>"]`
 - `["amenity", "<amenity type>"]`
 - `["hours", "<day of week abbrevation>", "<shift one>", "<shift two>", ...]` - e.g., ["hours","thu","09:00/12:30","13:30/17:00"]
-- `["l", "<type>"]` — freeform type labels used to reduce results for usecase (e.g., `business`, `rv_park`, `restaurant`, etc.)
+- `["L", "physical-location"]`
+- `["l", "<physical-location-type>", "physical-location"]` - freeform type labels used to reduce results for usecase (e.g., `business`, `rv-park`, `restaurant`, etc.)
 
 ### 3.3. Optional tags
 
@@ -89,7 +90,7 @@ Clients need a simple, relay-indexable way to discover physical places (e.g., RV
       "djj2",
       "djj8"
     ],
-    "#l": ["rv_park"]
+    "#l": ["rv-park"]
   }
   ```
 
@@ -116,8 +117,9 @@ Clients need a simple, relay-indexable way to discover physical places (e.g., RV
   "created_at": 1758720595,
   "tags": [
     ["d", "permit:FL:1234567"],
-    ["l", "business"],
-    ["l", "rv_park"],
+    ["L", "physical-location"],
+    ["l", "business", "physical-location"],
+    ["l", "rv-park", "physical-location"],
     ["name", "Lochloosa Harbor RV Park"],
     ["payment_method", "USD", "credit_card"],
     ["payment_method", "USD", "apple_pay"],
diff --git a/README.md b/README.md
index f5194ded..036ba870 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 - [NIP-38: User Statuses](38.md)
 - [NIP-39: External Identities in Profiles](39.md)
 - [NIP-40: Expiration Timestamp](40.md)
+- [NIP-41: Physical Locations](41.md)
 - [NIP-42: Authentication of clients to relays](42.md)
 - [NIP-44: Encrypted Payloads (Versioned)](44.md)
 - [NIP-45: Counting results](45.md)
@@ -264,9 +265,10 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 | `31990`       | Handler information             | [89](89.md)                            |
 | `32267`       | Software Application            |                                        |
 | `34550`       | Community Definition            | [72](72.md)                            |
+| `37515`       | Physical Location               | [42](42.md)                            |
+| `37516`       | Geocache listing                | [geocaching](geocaching)               |
 | `38172`       | Cashu Mint Announcement         | [87](87.md)                            |
 | `38173`       | Fedimint Announcement           | [87](87.md)                            |
-| `37516`       | Geocache listing                | [geocaching](geocaching)               |
 | `38383`       | Peer-to-peer Order events       | [69](69.md)                            |
 | `39000-9`     | Group metadata events           | [29](29.md)                            |
 | `39089`       | Starter packs                   | [51](51.md)                            |