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-rw-r--r--src/libgamma-error.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/libgamma-error.h b/src/libgamma-error.h
index 1591fe1..06a7077 100644
--- a/src/libgamma-error.h
+++ b/src/libgamma-error.h
@@ -297,7 +297,10 @@ extern const char* libgamma_group_name;
* used to print the current error stored in `errno`.
* If `error_code` is non-negative (an `errno` value`), that
* value will be stored in `errno` and `perror` will be
- * used to print it.
+ * used to print it. Additionally, if the `error_code` is
+ * the value of `LIBGAMMA_DEVICE_REQUIRE_GROUP` the
+ * required group will be printed with its numerical value
+ * and, if known, its name.
*
* @param name The text to add at the beginning.
* @param value The error code, may be an `errno` value.