diff --git a/DESCRIPTION b/DESCRIPTION
index 80c08bec8..2956cad60 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,5 +1,5 @@
 Package: AMR
-Version: 3.0.1.9016
+Version: 3.0.1.9017
 Date: 2026-01-08
 Title: Antimicrobial Resistance Data Analysis
 Description: Functions to simplify and standardise antimicrobial resistance (AMR)
diff --git a/NEWS.md b/NEWS.md
index d5050c1fa..54c901a67 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# AMR 3.0.1.9016
+# AMR 3.0.1.9017
 
 ### New
 * Integration with the **tidymodels** framework to allow seamless use of SIR, MIC and disk data in modelling pipelines via `recipes`
diff --git a/R/ab_property.R b/R/ab_property.R
index 8700f086f..5058a96aa 100755
--- a/R/ab_property.R
+++ b/R/ab_property.R
@@ -163,6 +163,7 @@ ab_tradenames <- function(x, ...) {
 }
 
 #' @rdname ab_property
+#' @param all_groups A [logical] to indicate whether all antimicrobial groups must be return as a vector for each input value. For example, an antibiotic in the "aminopenicillins" group, is also in the "penicillins" and "beta-lactams" groups. Setting `all_groups = TRUE` would return all three for such an antibiotic, while `all_groups = FALSE` (default) only returns the most distinctive group name.
 #' @export
 ab_group <- function(x, language = get_AMR_locale(), all_groups = FALSE, ...) {
   meet_criteria(x, allow_NA = TRUE)
@@ -171,11 +172,9 @@ ab_group <- function(x, language = get_AMR_locale(), all_groups = FALSE, ...) {
 
   grps <- ab_validate(x = x, property = "group", ...)
   for (i in seq_along(grps)) {
-    # take the first match based on ABX_PRIORITY_LIST
     if (all_groups == FALSE) {
+      # take the first match based on ABX_PRIORITY_LIST
       grps[[i]] <- grps[[i]][1]
-    } else if (length(grps[[i]]) > 1) {
-      grps[[i]] <- grps[[i]][grps[[i]] != "Beta-lactamase inhibitors"] # leave these out if there are other groups
     }
     if (language != "en") {
       grps[[i]] <- translate_into_language(grps[[i]], language = language, only_affect_ab_names = TRUE)
diff --git a/man/ab_property.Rd b/man/ab_property.Rd
index 7673b7d41..188bf130e 100644
--- a/man/ab_property.Rd
+++ b/man/ab_property.Rd
@@ -59,6 +59,8 @@ set_ab_names(data, ..., property = "name", language = get_AMR_locale(),
 
 \item{...}{In case of \code{\link[=set_ab_names]{set_ab_names()}} and \code{data} is a \link{data.frame}: columns to select (supports tidy selection such as \code{column1:column4}), otherwise other arguments passed on to \code{\link[=as.ab]{as.ab()}}.}
 
+\item{all_groups}{A \link{logical} to indicate whether all antimicrobial groups must be return as a vector for each input value. For example, an antibiotic in the "aminopenicillins" group, is also in the "penicillins" and "beta-lactams" groups. Setting \code{all_groups = TRUE} would return all three for such an antibiotic, while \code{all_groups = FALSE} (default) only returns the most distinctive group name.}
+
 \item{only_first}{A \link{logical} to indicate whether only the first ATC code must be returned, with giving preference to J0-codes (i.e., the antimicrobial drug group).}
 
 \item{administration}{Way of administration, either \code{"oral"} or \code{"iv"}.}
diff --git a/tests/testthat/test-ab_property.R b/tests/testthat/test-ab_property.R
index 6198b22c0..a0505a34d 100644
--- a/tests/testthat/test-ab_property.R
+++ b/tests/testthat/test-ab_property.R
@@ -40,6 +40,7 @@ test_that("test-ab_property.R", {
   expect_inherits(ab_tradenames(c("AMX", "AMX")), "list")
 
   expect_identical(ab_group("AMX", language = NULL), "Aminopenicillins")
+  expect_identical(ab_group("AMX", language = NULL, all_groups = TRUE), c("Aminopenicillins", "Penicillins", "Beta-lactams"))
   expect_identical(ab_atc_group1("AMX", language = NULL), "Beta-lactam antibacterials, penicillins")
   expect_identical(ab_atc_group2("AMX", language = NULL), "Penicillins with extended spectrum")