diff --git a/develop/doc/operators.json b/develop/doc/operators.json
index 2fc5082971cb78d61e0c32137a16a863553da57c..894b56e75ac1bfa0d222c7f2f8e5298d9f72b18b 100644
--- a/develop/doc/operators.json
+++ b/develop/doc/operators.json
@@ -4645,7 +4645,7 @@
  } ] 
 },{
  "type" : "gru",
- "comment" : "\nGRU Operator implements part calculations of the complete GRU as following:\n\n\\f[\nupdate \\ gate: u_t = actGate(xu_t + W_u * h_{t-1} + b_u) \\\\\nreset \\ gate: r_t = actGate(xr_t + W_r * h_{t-1} + b_r)  \\\\\noutput \\ candidate: {h}_t = actNode(xc_t + W_c * dot(r_t, h_{t-1}) + b_c) \\\\\noutput: h_t = dot((1 - u_t), h_{t-1}) + dot(u_t, {h}_t)\n\\f]\n\n@note To implement the complete GRU, fully-connected operator must be used  \nbefore to feed xu, xr and xc as the Input of GRU operator.\n",
+ "comment" : "\nGRU Operator implements part calculations of the complete GRU as following:\n\n$$\nupdate\\_gate: u_t = actGate(xu_t + W_u * h_{t-1} + b_u) \\\\\nreset\\_gate: r_t = actGate(xr_t + W_r * h_{t-1} + b_r)  \\\\\noutput\\_candidate: {h}_t = actNode(xc_t + W_c * dot(r_t, h_{t-1}) + b_c) \\\\\noutput: h_t = dot((1 - u_t), h_{t-1}) + dot(u_t, {h}_t)\n$$\n\n@note To implement the complete GRU, fully-connected operator must be used\nbefore to feed xu, xr and xc as the Input of GRU operator.\n",
  "inputs" : [ 
  { 
    "name" : "Input",