diff --git a/R/grob_vertex.R b/R/grob_vertex.R
index c5255c1..e4aff18 100644
--- a/R/grob_vertex.R
+++ b/R/grob_vertex.R
@@ -6,6 +6,33 @@
 #' Generating coordinates
 #' @noRd
 grob_vertex <- function(netenv, v) {
+
+  # Add formula handling
+  if(is.formula(netenv$vertex.nsides)) {
+    var_name <- all.vars(netenv$vertex.nsides)[1]
+    netenv$vertex.nsides <- eval(netenv$vertex.nsides, envir = data)
+  }
+
+  # Relax vertex.nsides validation
+  if(!is.numeric(netenv$vertex.nsides[v]) & !is.character(netenv$vertex.nsides[v])) {
+    stop("vertex.nsides must be numeric or character")
+  }
+
+  # Handle shape names
+  if(is.character(netenv$vertex.nsides[v])) {
+
+    shape <- netenv$vertex.nsides[v]
+
+    if(shape %in% names(sides_lookup)) {
+      info <- sides_lookup[[shape]]
+      netenv$vertex.nsides[v] <- info$sides
+      netenv$vertex.rot[v] <- info$rot
+    } else {
+      stop("Invalid shape name: ", shape)
+    }
+
+  }
+
   validate_netenv(netenv)
   validate_params(v)
   sides_lookup <- c(
@@ -18,22 +45,7 @@ grob_vertex <- function(netenv, v) {
     octagon  = list(sides = 8, rot = 0),
     circle   = list(sides = 25, rot = 0)
   )
-  # if(is.na(netenv$vertex.label[v])) {
-  #   stop("Missing vertex label value")
-  # }
-  # if(!netenv$vertex.label[v] %in% names(sides_lookup)) {
-  #   stop("Invalid vertex shape name: ", netenv$vertex.label[v])
-  # }
 
-  # if(is.na(netenv$layout[v, 1]) || is.na(netenv$layout[v, 2])) {
-  #   stop("Missing vertex coordinates")
-  # }
-  # if(netenv$layout[v, 1] < 0 || netenv$layout[v, 2] < 0) {
-  #   warning("Negative coordinate values")
-  # }
-  # if(!is.character(col)) {
-  #   stop("Invalid color value")
-  # }
   if (netenv$skip.vertex)
     return(
       grid::gTree(
@@ -46,27 +58,6 @@ grob_vertex <- function(netenv, v) {
       )
     )
 
-  # Only if it is character
-  if (is.numeric(netenv$vertex.nsides[v])) {
-
-    if(netenv$vertex.nsides[v] < 2) { # Only if numeric...
-      stop("Number of sides must be 2 or greater")
-    }
-
-  } else if (is.character(netenv$vertex.nsides[v]) {
-
-    if(netenv$vertex.nsides[v] %in% names(sides_lookup)) {
-      info <- sides_lookup[[netenv$vertex.nsides[v]]]
-      netenv$vertex.nsides[v] <- info$sides
-      netenv$vertex.rot[v] <- info$rot
-    } else {
-      stop("Invalid vertex shape name: ", netenv$vertex.nsides[v])
-    }
-
-  }
-
-  # If it is numeric, check the number of sides (as you do above)
-
   # Computing coordinates
   coords <- npolygon(
     x = netenv$layout[v, 1],
@@ -75,6 +66,7 @@ grob_vertex <- function(netenv, v) {
     r = netenv$vertex.size[v]*(1 - netenv$vertex.frame.prop[v]),
     d = netenv$vertex.rot[v]
   )
+
   # Frame coordinates
   framecoords <- npolygon(
     x = netenv$layout[v, 1],
@@ -83,13 +75,16 @@ grob_vertex <- function(netenv, v) {
     r = netenv$vertex.size[v],
     d = netenv$vertex.rot[v]
   )
+
   # Create color palette
   nsides <- unique(netenv$vertex.nsides)
   ncolors <- length(nsides)
   colors <- hsv(h = seq(0, 1, length.out = ncolors), v = 1, a = 1)
   pal <- setNames(colors, nsides)
+
   # Lookup color for this vertex based on number of sides
   col <- pal[as.character(netenv$vertex.nsides[v])]
+
   # Returning
   ans <- grid::polygonGrob(
     x = c(coords[,1]),
@@ -101,6 +96,7 @@ grob_vertex <- function(netenv, v) {
     default.units = "native",
     name = "core"
   )
+
   ans <- grid::grobTree(
     grid::polygonGrob(
       x = framecoords[,1],
@@ -115,7 +111,7 @@ grob_vertex <- function(netenv, v) {
     ans,
     name = netplot_name$make(v)
   )
-  # If the users is drawing text
+# If the users is drawing text
   if (length(netenv$vertex.label) && !is.na(netenv$vertex.label[v])) {
     # Only if it is big enough
     if (netenv$label_threshold <= netenv$vertex.size[v])