diff --git a/src/Transaction.tsx b/src/Transaction.tsx
index 29c7208..0edd994 100644
--- a/src/Transaction.tsx
+++ b/src/Transaction.tsx
@@ -82,6 +82,8 @@ const Transaction: React.FC = () => {
               <Details
                 txData={txData}
                 txDesc={txDesc}
+                userDoc={metadata?.output.userdoc}
+                devDoc={metadata?.output.devdoc}
                 internalOps={internalOps}
                 sendsEthToMiner={sendsEthToMiner}
                 ethUSDPrice={blockETHUSDPrice}
diff --git a/src/transaction/Details.tsx b/src/transaction/Details.tsx
index bfd8747..8cad060 100644
--- a/src/transaction/Details.tsx
+++ b/src/transaction/Details.tsx
@@ -37,10 +37,13 @@ import PercentagePosition from "../components/PercentagePosition";
 import ModeTab from "../components/ModeTab";
 import DecodedParamsTable from "./decoder/DecodedParamsTable";
 import { rawInputTo4Bytes, use4Bytes } from "../use4Bytes";
+import { DevDoc, UserDoc } from "../useSourcify";
 
 type DetailsProps = {
   txData: TransactionData;
   txDesc: TransactionDescription | null | undefined;
+  userDoc?: UserDoc | undefined;
+  devDoc?: DevDoc | undefined;
   internalOps?: InternalOperation[];
   sendsEthToMiner: boolean;
   ethUSDPrice: BigNumber | undefined;
@@ -49,6 +52,8 @@ type DetailsProps = {
 const Details: React.FC<DetailsProps> = ({
   txData,
   txDesc,
+  userDoc,
+  devDoc,
   internalOps,
   sendsEthToMiner,
   ethUSDPrice,
@@ -80,6 +85,8 @@ const Details: React.FC<DetailsProps> = ({
   }, [txData, fourBytesEntry]);
 
   const resolvedTxDesc = txDesc ?? fourBytesTxDesc;
+  const userMethod = txDesc ? userDoc?.methods[txDesc.signature] : undefined;
+  const devMethod = txDesc ? devDoc?.methods[txDesc.signature] : undefined;
 
   return (
     <ContentFrame tabs>
@@ -353,6 +360,8 @@ const Details: React.FC<DetailsProps> = ({
                   paramTypes={resolvedTxDesc.functionFragment.inputs}
                   txData={txData}
                   hasParamNames={resolvedTxDesc === txDesc}
+                  userMethod={userMethod}
+                  devMethod={devMethod}
                 />
               )}
             </Tab.Panel>
diff --git a/src/transaction/decoder/DecodedParamRow.tsx b/src/transaction/decoder/DecodedParamRow.tsx
index 988e536..bd94dc4 100644
--- a/src/transaction/decoder/DecodedParamRow.tsx
+++ b/src/transaction/decoder/DecodedParamRow.tsx
@@ -1,5 +1,9 @@
-import React, { ReactNode } from "react";
+import React, { ReactNode, useState } from "react";
 import { ParamType } from "@ethersproject/abi";
+import { Switch } from "@headlessui/react";
+import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
+import { faQuestionCircle } from "@fortawesome/free-regular-svg-icons/faQuestionCircle";
+import { faQuestionCircle as faQuestionCircleSolid } from "@fortawesome/free-solid-svg-icons/faQuestionCircle";
 import Uint256Decoder from "./Uint256Decoder";
 import AddressDecoder from "./AddressDecoder";
 import BooleanDecoder from "./BooleanDecoder";
@@ -13,6 +17,7 @@ type DecodedParamRowProps = {
   paramType: ParamType;
   txData: TransactionData;
   arrayElem?: number | undefined;
+  help?: string | undefined;
 };
 
 const DecodedParamRow: React.FC<DecodedParamRowProps> = ({
@@ -22,71 +27,95 @@ const DecodedParamRow: React.FC<DecodedParamRowProps> = ({
   paramType,
   txData,
   arrayElem,
-}) => (
-  <>
-    <tr className="grid grid-cols-12 gap-x-2 py-2 hover:bg-gray-100">
-      <td className="col-span-3 pl-1">
-        {prefix && <span className="text-gray-300">{prefix}</span>}
-        {arrayElem !== undefined ? (
-          <span className="text-gray-400">
-            {" "}
-            [<span className="text-black">{arrayElem}</span>]
-          </span>
-        ) : (
-          <>
-            {paramType.name ?? <span className="italic">param_{i}</span>}{" "}
-            {i !== undefined && (
-              <span className="text-gray-400 text-xs">({i})</span>
-            )}
-          </>
-        )}
-      </td>
-      <td className="col-span-1 text-gray-500">{paramType.type}</td>
-      <td className="col-span-8 pr-1 font-code break-all">
-        {paramType.baseType === "uint256" ? (
-          <Uint256Decoder r={r} />
-        ) : paramType.baseType === "address" ? (
-          <AddressDecoder r={r} txData={txData} />
-        ) : paramType.baseType === "bool" ? (
-          <BooleanDecoder r={r} />
-        ) : paramType.baseType === "bytes" ? (
-          <BytesDecoder r={r} />
-        ) : paramType.baseType === "tuple" || paramType.baseType === "array" ? (
-          <></>
-        ) : (
-          r.toString()
-        )}
-      </td>
-    </tr>
-    {paramType.baseType === "tuple" &&
-      r.map((e: any, idx: number) => (
-        <DecodedParamRow
-          key={idx}
-          prefix={
-            paramType.name ? (
-              paramType.name + "."
+  help,
+}) => {
+  const [showHelp, setShowHelp] = useState<boolean>(false);
+
+  return (
+    <>
+      <tr className="grid grid-cols-12 gap-x-2 py-2 hover:bg-gray-100">
+        <td className="col-span-3 pl-1">
+          <div>
+            {prefix && <span className="text-gray-300">{prefix}</span>}
+            {arrayElem !== undefined ? (
+              <span className="text-gray-400">
+                {" "}
+                [<span className="text-black">{arrayElem}</span>]
+              </span>
             ) : (
-              <span className="italic">param_{i}.</span>
-            )
-          }
-          i={idx}
-          r={e}
-          paramType={paramType.components[idx]}
-          txData={txData}
-        />
-      ))}
-    {paramType.baseType === "array" &&
-      r.map((e: any, idx: number) => (
-        <DecodedParamRow
-          key={idx}
-          prefix={paramType.name ?? <span className="italic">param_{i}</span>}
-          r={e}
-          paramType={paramType.arrayChildren}
-          txData={txData}
-          arrayElem={idx}
-        />
-      ))}
-  </>
-);
+              <>
+                {paramType.name ?? <span className="italic">param_{i}</span>}{" "}
+                {i !== undefined && (
+                  <span className="text-gray-400 text-xs">({i})</span>
+                )}
+              </>
+            )}
+            {help && (
+              <>
+                {" "}
+                <Switch
+                  checked={showHelp}
+                  onChange={setShowHelp}
+                  className="text-gray-500"
+                >
+                  <FontAwesomeIcon
+                    icon={showHelp ? faQuestionCircleSolid : faQuestionCircle}
+                    size="1x"
+                  />
+                </Switch>
+              </>
+            )}
+          </div>
+          {help && showHelp && <div className="mt-2 text-gray-400">{help}</div>}
+        </td>
+        <td className="col-span-1 text-gray-500">{paramType.type}</td>
+        <td className="col-span-8 pr-1 font-code break-all">
+          {paramType.baseType === "uint256" ? (
+            <Uint256Decoder r={r} />
+          ) : paramType.baseType === "address" ? (
+            <AddressDecoder r={r} txData={txData} />
+          ) : paramType.baseType === "bool" ? (
+            <BooleanDecoder r={r} />
+          ) : paramType.baseType === "bytes" ? (
+            <BytesDecoder r={r} />
+          ) : paramType.baseType === "tuple" ||
+            paramType.baseType === "array" ? (
+            <></>
+          ) : (
+            r.toString()
+          )}
+        </td>
+      </tr>
+      {paramType.baseType === "tuple" &&
+        r.map((e: any, idx: number) => (
+          <DecodedParamRow
+            key={idx}
+            prefix={
+              paramType.name ? (
+                paramType.name + "."
+              ) : (
+                <span className="italic">param_{i}.</span>
+              )
+            }
+            i={idx}
+            r={e}
+            paramType={paramType.components[idx]}
+            txData={txData}
+          />
+        ))}
+      {paramType.baseType === "array" &&
+        r.map((e: any, idx: number) => (
+          <DecodedParamRow
+            key={idx}
+            prefix={paramType.name ?? <span className="italic">param_{i}</span>}
+            r={e}
+            paramType={paramType.arrayChildren}
+            txData={txData}
+            arrayElem={idx}
+          />
+        ))}
+    </>
+  );
+};
 
 export default React.memo(DecodedParamRow);
diff --git a/src/transaction/decoder/DecodedParamsTable.tsx b/src/transaction/decoder/DecodedParamsTable.tsx
index 636dd67..f7daee5 100644
--- a/src/transaction/decoder/DecodedParamsTable.tsx
+++ b/src/transaction/decoder/DecodedParamsTable.tsx
@@ -2,12 +2,15 @@ import React from "react";
 import { ParamType, Result } from "@ethersproject/abi";
 import DecodedParamRow from "./DecodedParamRow";
 import { TransactionData } from "../../types";
+import { DevMethod, UserMethod } from "../../useSourcify";
 
 type DecodedParamsTableProps = {
   args: Result;
   paramTypes: ParamType[];
   txData: TransactionData;
   hasParamNames?: boolean;
+  userMethod?: UserMethod | undefined;
+  devMethod?: DevMethod | undefined;
 };
 
 const DecodedParamsTable: React.FC<DecodedParamsTableProps> = ({
@@ -15,6 +18,7 @@ const DecodedParamsTable: React.FC<DecodedParamsTableProps> = ({
   paramTypes,
   txData,
   hasParamNames = true,
+  devMethod,
 }) => (
   <table className="border w-full">
     <thead>
@@ -43,6 +47,7 @@ const DecodedParamsTable: React.FC<DecodedParamsTableProps> = ({
           r={r}
           paramType={paramTypes[i]}
           txData={txData}
+          help={devMethod?.params?.[paramTypes[i].name]}
         />
       ))}
     </tbody>
diff --git a/src/useSourcify.ts b/src/useSourcify.ts
index b60fde9..0d6ea59 100644
--- a/src/useSourcify.ts
+++ b/src/useSourcify.ts
@@ -3,6 +3,33 @@ import { Interface } from "@ethersproject/abi";
 import { TransactionData } from "./types";
 import { sourcifyMetadata, SourcifySource, sourcifySourceFile } from "./url";
 
+export type UserMethod = {
+  notice?: string | undefined;
+};
+
+export type UserEvent = {
+  notice?: string | undefined;
+};
+
+export type UserDoc = {
+  kind: "user";
+  version?: number | undefined;
+  notice?: string | undefined;
+  methods: Record<string, UserMethod>;
+  events: Record<string, UserEvent>;
+};
+
+export type DevMethod = {
+  params?: Record<string, string>;
+  returns?: Record<string, string>;
+};
+
+export type DevDoc = {
+  kind: "dev";
+  version?: number | undefined;
+  methods: Record<string, DevMethod>;
+};
+
 export type Metadata = {
   version: string;
   language: string;
@@ -33,8 +60,8 @@ export type Metadata = {
   };
   output: {
     abi: any[];
-    userdocs: any[];
-    devdoc: any[];
+    userdoc?: UserDoc | undefined;
+    devdoc?: DevDoc | undefined;
   };
 };