diff --git a/extensions/functions_logarithmic.yaml b/extensions/functions_logarithmic.yaml
index 8f9925c28..e8cc43ae9 100644
--- a/extensions/functions_logarithmic.yaml
+++ b/extensions/functions_logarithmic.yaml
@@ -102,5 +102,31 @@ scalar_functions:
             name: "base"
             description: "The logarithm base `b` to use"
         return: fp64
+  -
+    name: "log1p"
+    description: >
+      Natural logarithm (base e) of 1 + x
 
+      log1p(x) => log(1+x)
+    impls:
+      - args:
+          - name: rounding
+            options: [ TIE_TO_EVEN, TIE_AWAY_FROM_ZERO, TRUNCATE, CEILING, FLOOR ]
+            required: false
+          - name: on_domain_error
+            options: [ NAN, ERROR ]
+            required: false
+          - name: x
+            value: fp32
+        return: fp32
+      - args:
+          - name: rounding
+            options: [ TIE_TO_EVEN, TIE_AWAY_FROM_ZERO, TRUNCATE, CEILING, FLOOR ]
+            required: false
+          - name: on_domain_error
+            options: [ NAN, ERROR ]
+            required: false
+          - name: x
+            value: fp64
+        return: fp64