diff --git a/metaquantome/cli.py b/metaquantome/cli.py
index ede63a0..a50712f 100755
--- a/metaquantome/cli.py
+++ b/metaquantome/cli.py
@@ -43,6 +43,7 @@ def cli():
                 img=args.img,
                 infile=args.infile,
                 mode=args.mode,
+                ontology=args.ontology,
                 meancol=args.meancol,
                 nterms=args.nterms,
                 strip=args.strip,
diff --git a/metaquantome/modules/run_viz.py b/metaquantome/modules/run_viz.py
index f139a5b..2c4913b 100644
--- a/metaquantome/modules/run_viz.py
+++ b/metaquantome/modules/run_viz.py
@@ -8,7 +8,7 @@
 
 def run_viz(plottype, img, infile, strip=None,
             mode=None, meancol=None, nterms='5', target_rank=None, barcol=6,  # barplot
-            textannot=None, fc_name=None, flip_fc=False, gosplit=False,  # volcano
+            textannot=None, fc_name=None, flip_fc=False, gosplit=False, ontology=None, # volcano
             sinfo=None, filter_to_sig=False, alpha='0.05',  # heatmap
             calculate_sep=False,  # pca
             whichway=None, name=None, id=None, target_onto=None, # ft_dist
@@ -24,7 +24,7 @@ def run_viz(plottype, img, infile, strip=None,
     if plottype == "bar":
         cmd += [mode, meancol, nterms, width, height, target_rank, target_onto, barcol, tabfile]
     elif plottype == "volcano":
-        cmd += [str(textannot), fc_name, flip_fc, gosplit, width, height, tabfile]
+        cmd += [str(textannot), fc_name, flip_fc, ontology, gosplit, width, height, tabfile]
     elif plottype == "heatmap":
         samp_grps = SampleGroups(sinfo)
         all_intcols_str = ','.join(samp_grps.all_intcols)
diff --git a/metaquantome/modules/viz.R b/metaquantome/modules/viz.R
index 5596dcf..1cb93b8 100644
--- a/metaquantome/modules/viz.R
+++ b/metaquantome/modules/viz.R
@@ -479,19 +479,21 @@ volcano_cli <- function(args){
     # 4. name of text annotation column
     # 5. name of fold change column
     # 6. whether to flip fc
-    # 7. whether to split GO by ontology/namespace
-    # 8. image width (default 5)
-    # 9. image height (default 5)
+    # 7. ontology
+    # 8. whether to split GO by ontology/namespace
+    # 9. image width (default 5)
+    # 10. image height (default 5)
     img <- args[2]
     infile <- args[3]
     df <- read_result(infile)
     textannot <- args[4]
     fc_name <- args[5]
     flip_fc <- (args[6] == "True")
-    gosplit <- (args[7] == "True")
-    width <- as.numeric(args[8])
-    height <- as.numeric(args[9])
-    tabfile <- args[10]
+    ontology <- args[7]
+    gosplit <- (args[8] == "True" & ontology == "go")
+    width <- as.numeric(args[9])
+    height <- as.numeric(args[10])
+    tabfile <- args[11]
     if (tabfile == "None") tabfile <- NULL
     plt <- mq_volcano(df, img=img, textannot=textannot, fc_name=fc_name,
                       flip_fc=flip_fc, gosplit=gosplit, width=width, height=height,