diff --git a/specification/metrics/semantic_conventions/runtime-environment-metrics.md b/specification/metrics/semantic_conventions/runtime-environment-metrics.md
index 8a58c9a..5b68cb2 100644
--- a/specification/metrics/semantic_conventions/runtime-environment-metrics.md
+++ b/specification/metrics/semantic_conventions/runtime-environment-metrics.md
@@ -63,15 +63,15 @@ All JVM metric attributes are required unless otherwise indicated.
 
 | Name                                           | Description                                                                                     | Unit         | Unit ([UCUM](README.md#instrument-units)) | Instrument Type ([*](README.md#instrument-types)) | Value Type | Attribute Key | Attribute Values      |
 |------------------------------------------------|-------------------------------------------------------------------------------------------------|--------------|-------------------------------------------|---------------------------------------------------|------------|---------------|-----------------------|
-| process.runtime.jvm.memory.usage               | Measure of memory used                                                                          | Bytes        | `By`                                      | UpDownCounter                                     | Int64      | type          | `"heap"`, `"nonheap"` |
+| process.runtime.jvm.memory.usage               | Measure of memory used                                                                          | Bytes        | `By`                                      | UpDownCounter                                     | Int64      | type          | `"heap"`, `"non_heap"` |
 |                                                |                                                                                                 |              |                                           |                                                   |            | pool          | Name of pool [1]      |
-| process.runtime.jvm.memory.init                | Measure of initial memory requested                                                             | Bytes        | `By`                                      | UpDownCounter                                     | Int64      | type          | `"heap"`, `"nonheap"` |
+| process.runtime.jvm.memory.init                | Measure of initial memory requested                                                             | Bytes        | `By`                                      | UpDownCounter                                     | Int64      | type          | `"heap"`, `"non_heap"` |
 |                                                |                                                                                                 |              |                                           |                                                   |            | pool          | Name of pool [1]      |
-| process.runtime.jvm.memory.committed           | Measure of memory committed                                                                     | Bytes        | `By`                                      | UpDownCounter                                     | Int64      | type          | `"heap"`, `"nonheap"` |
+| process.runtime.jvm.memory.committed           | Measure of memory committed                                                                     | Bytes        | `By`                                      | UpDownCounter                                     | Int64      | type          | `"heap"`, `"non_heap"` |
 |                                                |                                                                                                 |              |                                           |                                                   |            | pool          | Name of pool [1]      |
-| process.runtime.jvm.memory.limit               | Measure of max obtainable memory                                                                | Bytes        | `By`                                      | UpDownCounter                                     | Int64      | type          | `"heap"`, `"nonheap"` |
+| process.runtime.jvm.memory.limit               | Measure of max obtainable memory                                                                | Bytes        | `By`                                      | UpDownCounter                                     | Int64      | type          | `"heap"`, `"non_heap"` |
 |                                                |                                                                                                 |              |                                           |                                                   |            | pool          | Name of pool [1]      |
-| process.runtime.jvm.memory.usage_after_last_gc | Measure of memory used, as measured after the most recent garbage collection event on this pool | Bytes        | `By`                                      | UpDownCounter                                     | Int64      | type          | `"heap"`, `"nonheap"` |
+| process.runtime.jvm.memory.usage_after_last_gc | Measure of memory used, as measured after the most recent garbage collection event on this pool | Bytes        | `By`                                      | UpDownCounter                                     | Int64      | type          | `"heap"`, `"non_heap"` |
 |                                                |                                                                                                 |              |                                           |                                                   |            | pool          | Name of pool [1]      |
 | process.runtime.jvm.threads.count              | Number of executing threads                                                                     | threads      | `{threads}`                               | UpDownCounter                                     | Int64      | daemon        | `true`, `false`       |
 | process.runtime.jvm.classes.loaded             | Number of classes loaded since JVM start                                                        | classes      | `{classes}`                               | Counter                                           | Int64      |               |                       |