diff --git a/src/util.jl b/src/util.jl
index b93daf54..d232defd 100644
--- a/src/util.jl
+++ b/src/util.jl
@@ -93,10 +93,10 @@ function versioninfo(io::IO=stdout)
             print(io, "   · $(device.name)")
 
             # show a list of tags
-            tags = []
+            tags = String[]
             ## memory back-ends
             let
-                svm_tags = []
+                svm_tags = String[]
                 svm_caps = cl.svm_capabilities(device)
                 if svm_caps.coarse_grain_buffer
                     push!(svm_tags, "c")
@@ -107,7 +107,7 @@ function versioninfo(io::IO=stdout)
                 push!(tags, "svm:"*join(svm_tags, "+"))
             end
             if cl.usm_supported(device)
-                usm_tags = []
+                usm_tags = String[]
                 usm_caps = cl.usm_capabilities(device)
                 if usm_caps.host.access
                     push!(usm_tags, "h")
@@ -133,6 +133,16 @@ function versioninfo(io::IO=stdout)
             if in("cl_khr_il_program", device.extensions)
                 push!(tags, "il")
             end
+            if cl.sub_groups_supported(device)
+                sg_tags = String[]
+                if in("cl_khr_subgroup_shuffle", device.extensions)
+                    push!(sg_tags, "shfl")
+                end
+                # if in("cl_khr_subgroup_ballot", device.extensions)
+                #     push!(sg_tags, "blt")
+                # end
+                push!(tags, "sg:"*join(sg_tags, "+"))
+            end
             ## render
             if !isempty(tags)
                 print(io, " (", join(tags, ", "), ")")