diff --git a/documentation/docs/guides/environment-variables.md b/documentation/docs/guides/environment-variables.md
index 043a10daf52e..b5a141625ba1 100644
--- a/documentation/docs/guides/environment-variables.md
+++ b/documentation/docs/guides/environment-variables.md
@@ -239,6 +239,7 @@ These variables control how Goose handles [tool execution](/docs/guides/goose-pe
 | `GOOSE_TOOLSHIM_OLLAMA_MODEL` | Specifies the model for [tool call interpretation](/docs/experimental/ollama) | Model name (e.g. llama3.2, qwen2.5) | System default |
 | `GOOSE_CLI_MIN_PRIORITY` | Controls verbosity of [tool output](/docs/guides/managing-tools/adjust-tool-output) | Float between 0.0 and 1.0 | 0.0 |
 | `GOOSE_CLI_TOOL_PARAMS_TRUNCATION_MAX_LENGTH` | Maximum length for tool parameter values before truncation in CLI output (not in debug mode) | Integer | 40 |
+| `GOOSE_DEBUG` | Enables debug mode to show full tool parameters without truncation | "1", "true" (case insensitive) to enable | false |
 
 **Examples**